Hi @Fatemeh ,
could you try and check what happens, if you use a GevServer from the tutorials folder of your CVB installation?
https://help.commonvisionblox.com/NextGen/14.0/md_theory_of_operation_tools__g_e_v_server.html
Also try to update to the latest CVB Version.
CVB 13.4.4
If you want to use the GevServer on the same machine as your acquisition code (very likely) make sure to use the SocketDriver Option on the GevServer and when configuring the device or discovering it in code also make sure to work on the SocketDriver.
If your code fails with the GevServer as well, we need a small running example of what you are trying to do.
With this we can start debugging further into the problem.
Cheers
Chris