Error while compilation process

[Altera_Forum]

Hello there, 

 I am using the 9.0 sp2 version of Quartus II.  When I try to compile my project, the process is stopped due an internal error. I don't know why this is happening. Can anyone help me please?  Here is the error message  Internal Error: Sub-system: AMERGE, File: /quartus/atm/amerge/amerge_kpt_op.cpp, Line: 220 cmp_merge_kpt_db Stack Trace: 0x3DD57 : amerge_mini_merge + 0x3A977 (atm_amerge)  End-trace  Quartus II Version 9.0 Build 235 06/17/2009 SJ Web Edition Service Pack Installed: 2  Thanks

[Altera_Forum]

Hi, 

 I faced the same issue and managed to resolve it. You can try in the following order and check if it works:   1) Device Pin options - Unconnected pins as input tri-stated 2) Open .qsf file (in notepad) and search for the word HUB. Delete all instances of assignments with word HUB. 3) Delete db and incremental_db from the project file 4) If none of these work...You will need to install another version of Quartus.. Atleast Quartus 9.1 sp2..   Rgds, BVP