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Problem solved:
For security reasons I'm using two different accounts on my mac. One user with administrator rights and one without administrator rights. Usually I'm working with the accout without administrator rights. That's the problem!
Most p...
I'm currently using Mac Mojave 10.14.6 and got the same Error message.
I found a tricky solution:
There seems to be some issues with access rights of the dylib libraries in the Framework folder
/Applications/Cisco Packet Tracer/Cisco Packet Trace...