Unable to remove module of node-red - node.js

Question

I am having issues with node-red and can no longer run any flows, i am not sure what to do anymore.
i get the following error
Imported unrecognised type: mqtt-env-broker
Flows stopped due to missing node types. Check logs for details.
Tried to remove this module from the palette but get the following error, i am also unable to disable it
Failed to remove: node-red-contrib-mqtt-env
Error: Type in use: mqtt-env-broker
Check the log for more information
I have installed the node-red-admin and tried to remove it from command line, so i issued the following command
sudo node-red-admin remove node-red-contrib-mqtt-env/mqtt-env
i get the following error
404: Cannot DELETE /nodes/node-red-contrib-mqtt-env/mqtt-env
this is what i get when i ran the following command
node-red-admin list
Nodes Types State
node-red-contrib-mqtt-env/mqtt-env mqtt-env in error
mqtt-env out
mqtt-env-broker
node-red-dashboard/ui_audio ui_audio enabled
...
...
node-red/mqtt mqtt in error
mqtt out
mqtt-broker

Answer 1

The flows are stopped because they are trying to use a node type you have not got installed - or in this instance, it appears, is hitting an error when it tries to start
The runtime won't let you remove the node because it is referenced in your flow.
To fix this you need to delete any of the nodes referenced by this module from your flow. The name mqtt-env-broker suggests it is a configuration node rather than a regular flow node. Open the Configuration Nodes sidebar panel (from the drop-down menu) and look for any unknown config nodes. Double click on them and delete them. Once you've removed them, hit deploy and things should start working again.
You should then be able to delete the node module from your runtime.