I'm a complete beginner sorry but I think I have managed to add the catch which is showing two errors:
{"topic":"","payload":"","_msgid":"bc276840.11d028","filename":"speedtestData.json","error":{"message":"Unexpected end of JSON input","source":{"id":"63a0c3bd.82248c","type":"json","count":1}}}
2nd message:
{"topic":"","payload":"","_msgid":"bc276840.11d028","filename":"speedtestDataPD.json","error":{"message":"Unexpected end of JSON input","source":{"id":"330c9ca3.cd2e44","type":"json","count":1}}}
I've not changed any filename paths (will have to look up how to do that if i need to)