Wall getting delete on own

I a code there is not any command to delete the wall but it is getting deleted when i run some command. The below image is before the command is executed


and this image is after execution

the wall is deleted by its own.
The command i am running is shown below and getting the error which is shown in other image

This is my code file and not able to solve the problem.

triaxial.txt (5.7 KB)

Hello @ShivamPandey,

I cannot run your data file. The highlighted value is undefined:

Dear sir,

Please kindly have a look at it and tell me if the code is correct. and sir, I am trying to simulate a triaxial test. Is it correct or not, and can you check it?

The one “sleeved triaxial test” in PFC example one is the Unconfined Undrained test.

undrained .dat (10.6 KB)