Quartus error

[Altera_Forum]

Hi all. 

 I make SignalTap II File(stp1.stp).  Add instances to the signalTap II file and nodes to each instance. Compile the design. But i meet follow error message.  Internal Error: Sub-system: CUT, File: /quartus/db/cut/cut_atom_io.cpp, Line: 4827 buffer_out_oterm->has_fanout_exactly(1) Stack Trace: 0x37789 : CUT_ATOM_IO::is_pseudo_differential_output_buffer_of_polarity + 0x79 (db_cut)  End-trace  Quartus II Version 8.0 Build 231 07/10/2008 SJ Full Version Service Pack Installed: 1  Please help me.

[Altera_Forum]

Whenever you get an internal error, file a service request at https://mysupport.altera.com/. Provide the Quartus project that produces the internal error and instructions that will enable an applications engineer to reproduce it. 

 The cause of an internal error could be a bug in Quartus or something you did wrong for which Quartus doesn't have a more graceful error message.

[Altera_Forum]

You're probably tapping a top-level bidir or output pin when compiling for a device family that's Cyclone III or Stratix III. Try disabling Incremental Compilation in the Settings menu. The problem should go away.  

 Your other options. Don't tap the pin directly. For a bidir, you can tap the ibuf in the post-fit netlist. It usually has the name <pin_name>~ibuf. For an output pin, you can tap whatever feeds the obuf, which usually has the name <pin_name>~obuf. Look at the post-fitting technology map viewer to see the fanin/fanout connections for the pin.