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I run Eve-ng in windows 10 in VM-workstation but I cannot open CLI of routers and switches. when I start them it shows this error
Slim Application Error
The application could not run because of the following error:
Details
Type: ErrorException
Code: 8
Message: Undefined offset:255
File: /opt/unetlab/html/includes/api_nodes.php
Line: 890
Trace

how can I fix it?

It looks like corrupted EVE.
I would reinstall it from scratch
Usually such issues starts when people without any clue start edit eve sytem files, php files
No one will answer what you did in your eve and what you changed..

Please check if Intel VT-X/EPT is enabled on your eve.
If yes and still same issue,
Re-install EVE