Thanks for replying. Below is the error. I'm also attaching some imagesmodelgeometry

"The license is currently in use by another application in this Workbench session such as Mechanical or another Mechanical APDL application.  You must wait until the other application has finished its task (for example meshing) or manually PAUSE the other Mechanical APDL application "

I only have 19 R3 version , and no any other application is running.. Can anyone tell me the reason?