abaqus 6.10 inp imported file problem

 dear i am student of mechanical enginnering and facing following dificulties in abaqus 6.10 can any body hel me out 

 i am working on the model imported as inp file from abaqus documentation but facing following difficulties

1. when i import model orphan mesh appears and unable to extract real geometry from orphan mesh  
2. for analytic rigid body mesh command is not applicable while in inp imported model analytic rigid body is meshed unable to understand how analytic rigid body can be meshed.
3. when i draw reference point for analytic rigid body the reference point is not selected as node in set defining assembly module . but in inp file reference point is selected as node.
4. i was unable to define node+element in single set but solved by merge command .
5. when i submit job lock file error appears .