I have this error.
Please help me to restore.
Many thanks
Has this arisen because you have imported a flow that uses those and you want to install them, or do you not want to use them? If you don't want to use them then start by looking in the Menu > Configuration Nodes and click Unused. They may be in there, in which case select and delete them and Deploy.
If you want to install those nodes then it looks like you need to install node-red-contrib-mdashboard (but I would query whether you really want to do that) and a mysql node, possibly node-red-node-mysql.
At the moment I don't want to use them, do first oprion solved the problem!
Many thanks
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