Error in function instead of subflow

Class constructor is in a subflow.

Function node instantiate a class that is passed from subflow by message
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If there is an error in my class that exists in subflow (UUID), function "generator" will be reported as error source
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This behavior is misleading and it will be a pain to maintain in the long run.
Can somebody give pointers how to restructure my code?

[{"id":"941fd592e84cbc49","type":"subflow","name":"UUID","info":"","category":"","in":[{"x":60,"y":60,"wires":[{"id":"45a422b149d5ba4a"}]}],"out":[{"x":340,"y":60,"wires":[{"id":"45a422b149d5ba4a","port":0}]}],"env":[],"meta":{},"color":"#DDAA99"},{"id":"45a422b149d5ba4a","type":"function","z":"941fd592e84cbc49","name":"UUID class","func":"class UUIDGenerator {\n    constructor({ siteUUID, library = {}, cabinet = \"\", module = {}, errorTextList = {}, variableSymbolicAddr = \"\", shuttle = {} }) {\n        this.siteUUID = siteUUID;\n        this.plcName = cabinet;\n        this.library = library;\n        this.modNumber = module.ModNo || \"\";\n        this.modType = module.ModType || \"\";\n        this.alarmVerNo = module.VerNo || \"\";\n        this.scadaVerNo = module.ScadaVerNo || \"\";\n        this.lacNo = module.LacNo;\n        this.shuttleID = shuttle.shuttleID;\n        this.shuttleType = shuttle.shuttleType\n\n        this.errTextListName = errorTextList.Name || \"\";\n        this.errTextListVersion = errorTextList.Version || \"\";\n\n        this.symbolicAddr = variableSymbolicAddr;\n\n        // Initialize cryptoJs within the class\n        // this.cryptoJs = global.get(\"cryptojs\");\n\n        this.siteSolution = global.get(\"files\").siteSolution\n        // node.warn({ siteSolution: this.siteSolution })\n        this.config = global.get(\"config\")\n\n        \n\n        // Incorporate SiteSolution object properties\n        this.isUpdateReq = this.config.uuid.autoGen ?? true;\n\n        this.modulesFile = this.siteSolution.modulesFile || []\n        this.modulesTypesFile = this.siteSolution.modulesTypesFile || []\n\n        // node.warn({ moduleTypesFile: this.modulesTypesFile})\n        this.cab = {}\n        this.modulePlc = {}\n        if (this.modulesFile.length > 0 && this.plcName){\n            this.cab = this.modulesFile.find(cabinet => cabinet.Name === this.plcName)\n            this.modulePlc = this.cab.Plcs.find(plc => plc.PlcName === this.plcName)\n        }\n    }\n\n    static spotKeys = global.get(\"spotKeys\") || []\n\n    static updateSpotKeys(spotKey) {\n        this.spotKeys.push(spotKey); // Update the static property\n        // node.warn({ spotKeys: this.spotKeys })\n        global.set(\"spotKeys\", this.spotKeys)\n    }\n\n    generateUUID(input) {\n        // Cut input string to 32 characters\n        const hash = \"a1bc19ad-1f4f-4327-bed6-d334ed27195c\"\n        const str = hash.substring(0, 32);\n\n        //arrange data to match CDH SpotKey\n        const movedstr = str.substring(6, 2) + str.substring(4, 2) + str.substring(2, 2) + str.substring(0, 2) + \"-\" + str.substring(10, 2) + str.substring(8, 2) + \"-\" +\n            str.substring(14, 2) + str.substring(12, 2) + \"-\" + str.substring(16, 2) + str.substring(18, 2) + \"-\" + str.substring(20, 12)\n\n        return movedstr;\n    }\n\n    moduleSearch(){\n        const plc = this.modulePlc\n        let module = {}\n        if (plc && plc.Modules) {\n            module = plc.Modules.find(module => module.ModuleNumber === this.modNumber)\n        }\n        return module\n    }\n\n    moduleTypeSearch() {\n        let type = {}\n        if (this.modulesTypesFile.length > 0) {\n            type = this.modulesTypesFile.find(type => type.Number === this.modType)\n        }\n        // node.warn({ moduleType: this.modType, type: type})\n        return type\n    }\n\n    cabinet(){     \n        const cab = this.cab\n        if (!this.isUpdateReq && cab.SpotKey){\n            //node.warn(cab.SpotKey)\n            return cab.SpotKey\n        }\n        else{\n            const input = `site:${this.siteUUID}/cabinet:${this.plcName}`\n            UUIDGenerator.updateSpotKeys(input)\n            //node.warn(input)\n            return this.generateUUID(input);\n        }\n\n    }\n    commanderVersion(){\n        const plc = this.modulePlc\n        if (!this.isUpdateReq && plc.CommanderVersion.SpotKey){\n            //node.warn(plc.CommanderVersion.SpotKey)\n            return plc.CommanderVersion.SpotKey\n        }\n        else{\n            const input = `site:${this.siteUUID}/productLine:${this.library.productLine}/version:${this.library.version}`\n            UUIDGenerator.updateSpotKeys(input)\n            // this.spotKeys.push(input)\n            // node.warn(input)\n            return this.generateUUID(input);\n        }\n    }\n    plc(){\n        const plc = this.modulePlc\n        if (!this.isUpdateReq && plc.SpotKey) {\n            //node.warn(plc.SpotKey)\n            return plc.SpotKey\n        }\n        else {\n            const input = `site:${this.siteUUID}/plc:${this.plcName}`\n            UUIDGenerator.updateSpotKeys(input)\n            // this.spotKeys.push(input)\n            //node.warn(input);\n            return this.generateUUID(input);\n        }\n    }\n    moduleType(){\n        const module = this.moduleSearch()\n        //search for moduleType from x0x-moduleTypes.json\n        const moduleType = this.moduleTypeSearch()\n        if (!this.isUpdateReq && (module?.ModuleType)) {\n            node.warn({\n                moduleType: this.modType, spotKey: module.ModuleType.SpotKey\n            })\n            return module.ModuleType.SpotKey\n        }\n        else if (moduleType){\n            // node.warn({\n            //     moduleType: moduleType.Number, spotKey: moduleType.spotKey\n            // })\n            return moduleType.spotKey\n        }\n        else{\n            const input = `site:${this.siteUUID}/moduletype:${this.modType}/alarmVersion:${this.alarmVerNo}/scadaVersion:${this.scadaVerNo}`;\n            UUIDGenerator.updateSpotKeys(input)\n            // this.spotKeys.push(input)\n            // node.warn(input)\n            return this.generateUUID(input);\n        }\n    }\n    module() {\n        const module = this.moduleSearch()\n        if (!this.isUpdateReq && module){\n            // node.warn({\n            //     module: this.modNumber, spotKey: module.SpotKey\n            // })\n            return module.SpotKey\n        }\n        else{\n            const input = `site:${this.siteUUID}/plc:${this.plcName}/module:${this.modNumber}`;\n            UUIDGenerator.updateSpotKeys(input)\n            // this.spotKeys.push(input)\n            return this.generateUUID(input);\n        }\n    }\n    lac(){\n        const module = this.moduleSearch()\n        if (!this.isUpdateReq && module.LocalAreaControl) {\n            // node.warn({\n            //     lac: this.lacNo, spotKey: module.LocalAreaControl.SpotKey\n            // })\n            return module.LocalAreaControl.SpotKey\n        }\n        else{\n            const input = `site:${this.siteUUID}/plc:${this.plcName}/lac:${this.lacNo}`;\n            UUIDGenerator.updateSpotKeys(input)\n            // this.spotKeys.push(input)\n            // node.warn(input)\n            return this.generateUUID(input);\n        }\n    }\n    moduleDBScada(){\n        const module = this.moduleSearch()\n        if (!this.isUpdateReq && module?.DBs){\n            const db = module.DBs.find(db => db.Name === \"SCADA\")\n            if (db){\n                // node.warn({\n                //     scadaDB: db.Offset, spotKey: db.SpotKey\n                // })\n                return db.SpotKey\n            }\n        }\n        else{\n            const input = `site:${this.siteUUID}/plc:${this.plcName}/module:${this.modNumber}/DBname:SCADA`\n            UUIDGenerator.updateSpotKeys(input)\n            // this.spotKeys.push(input)\n            // node.warn(input)\n            return this.generateUUID(input);\n        }\n    }\n\n    alarmDefinition() {\n        const type = this.moduleTypeSearch()\n        if (!this.isUpdateReq && type?.AlarmDefinition){\n            // node.warn({\n            //     alarmDefinition: type, spotKey: type.AlarmDefinition.spotKey\n            // })\n            return type.AlarmDefinition.spotKey\n        }\n        else{\n            const input = `site:${this.siteUUID}/product:${this.library.productLine}/moduletype:${this.modType}/alarmdef:${this.alarmVerNo}`;\n            UUIDGenerator.updateSpotKeys(input)\n            // this.spotKeys.push(input)\n            // node.warn(input)\n            return this.generateUUID(input);\n        }\n    }\n\n    scadaDefinition(){\n        const type = this.moduleTypeSearch()\n        if (!this.isUpdateReq && type?.ModuleTypeVersion) {\n            // node.warn({\n            //     scadaDefinition: type, spotKey: type.ModuleTypeVersion.SpotKey\n            // })\n            return type.ModuleTypeVersion.SpotKey\n        }\n        else{\n            const input = `site:${this.siteUUID}/product:${this.library.productLine}/moduletype:${this.modType}/scadadef:${this.scadaVerNo}`;\n            UUIDGenerator.updateSpotKeys(input)\n            // this.spotKeys.push(input)\n            // node.warn(input)\n            return this.generateUUID(input)\n        }\n    }\n    errorCode(){\n        const input = `site:${this.siteUUID}/errorList:${this.errTextListName}/version:${this.errTextListVersion}`\n        // this.spotKeys.push(input)\n        // node.warn(input)\n        return this.generateUUID(input)\n    }\n    scadaVariable(){\n        const type = this.moduleTypeSearch()\n        // node.warn({type:type})\n        if (!this.isUpdateReq && type?.Variables) {\n            const scadaVar = type.Variables.find(variable => variable.SymbolicDataBlockAddress === this.symbolicAddr)\n            //in case unfiltered variable like GMS, etc.\n            if (!scadaVar){\n                const input = `site:${this.siteUUID}/moduletype:${this.modType}/alarmVersion:${this.alarmVerNo}/scadaVersion:${this.scadaVerNo}/variable:${this.symbolicAddr}`\n                UUIDGenerator.updateSpotKeys(input)\n                // node.warn({\n                //     scadaVar: scadaVar,\n                //     vars: type.Variables,\n                //     symbolic: this.symbolicAddr\n                // })\n                return this.generateUUID(input)\n            }\n            else{\n                // node.warn({\n                //     scadaVar: scadaVar, \n                //     spotKey: scadaVar.SpotKey\n                // })\n                return scadaVar.SpotKey\n            }\n\n        }\n        else{\n            const input = `site:${this.siteUUID}/moduletype:${this.modType}/alarmVersion:${this.alarmVerNo}/scadaVersion:${this.scadaVerNo}/variable:${this.symbolicAddr}`\n            UUIDGenerator.updateSpotKeys(input)\n            // this.spotKeys.push(input)\n            // node.warn(input)\n            return this.generateUUID(input)\n        }\n    }\n    shuttle(){\n        const input = `site:${this.siteUUID}/shuttleType:${this.shuttleType}/shuttleID:${this.shuttleID}`\n        UUIDGenerator.updateSpotKeys(input)\n        // this.spotKeys.push(input)\n        //node.warn(input)\n        return this.generateUUID(input)\n    }\n\n}\n\nmsg.UUIDgeneratorClass = UUIDGenerator\n\nreturn msg;","outputs":1,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":190,"y":60,"wires":[[]]},{"id":"f2f20e7a5614c21c","type":"subflow:941fd592e84cbc49","z":"42df28f38b7015cb","name":"","x":670,"y":1040,"wires":[["2acf46298d8e3ec0"]]},{"id":"2acf46298d8e3ec0","type":"function","z":"42df28f38b7015cb","name":"generator","func":"const UUIDGenerator = msg.UUIDgeneratorClass\nconst library = \n        {\n            productLine: \"STS\", //Select STS,CTC_ULC,TRX\n            version: 9 //From project name e.g W001 - STS_V011\n        }\nconst moduleData = {\n    modNo: 1100,\n   \n}\n\nconst uuidGenerator = new UUIDGenerator({ siteUUID: \"0xf8\", library: library, cabinet: \"F001\", module: moduleData });\n\nconst spotKey = uuidGenerator.module()\nreturn msg;","outputs":1,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":840,"y":1040,"wires":[["d78720134ec5c2f5"]]},{"id":"72e35f822eca17c1","type":"inject","z":"42df28f38b7015cb","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":480,"y":1040,"wires":[["f2f20e7a5614c21c"]]},{"id":"d78720134ec5c2f5","type":"debug","z":"42df28f38b7015cb","name":"debug 5","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":1000,"y":1040,"wires":[]}]

the only requirement is that I want to keep contents of subflow in one place and I'm reluctant to use global context