I'm currently using the Cisco packet tracer 7.2.1 0218, and I was trying to open some labs of the CCNA R&S course and I've received a message that said next "we noticed this file contained some recoverable errors and have fixed it for you. You may notice devices or containers may be in a different location or of a different size than was originally created". Indeed! the lab was opened but I'can work with it.
Have someone a similar issue, or a solution to this problem?
Ok, I have found the solution: instead of clicking on *.pkt file, open it from the packet tracer. Works fine