Thank you very much, Ishan. I just tried it and unfortunately, it didn't work. It is constantly showing this message on the APDL output window, GUI, and error file.
I really don't understand what it means by "specified displacement from the previous command D...". Even if I run my simulation for 2 times step, again hundreds of times this warning must be shown first before going to the solution. I don't have this D command in a loop.

Thank you!