error in gambit
 

hi my dear friends i try a 3D pipe in gambit and use a specific mesh that i see in a jornal when i tya to save it i see this error :
please help me
it is very important for me ?
hi my dear friends i try a 3D pipe in gambit and use a specific mesh that i see in a jornal when i tya to save it i see this error :
please help me
it is very important for me ?

error : the mesh on face face.14 is used by more than 2 volumes . such mesh cannot be exported.