Error while starting exampleB1 in Geant4

Hello I am a new user to GEANT4 in linux. When I am trying to run this program I am getting the error.

It will be helpful if someone tell me how to resolve this


Not enough information - could you post the additional backtrace entries that are off the top of the screen (and all other output from the run) please? Note that we prefer that you copy and paste text rather than screenshots for this reason. This text can be posted between triple backticks to format it correctly, e.g. typing in

[PID=7742 …]

would display as:

[PID=7742 ...]