So it seems that the configuration running on your control was set up with another one.
The easiest way would to simply create a new configuration and set it to active but then all the data will be lost:
If you want to keep your data there are more steps to do:
1) Export PLC Application from the actual program if needed afterwards:
2) Download your configuration and delete the PLC part:
3) Create a new configuration upload the manipulated configuration and activated it (and perhaps reboot the control afterwards):
4) Create a new PLC program and import your exported code.
Now you should be able to normally login again.
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