Internal Error with EDA Netlist Writer

Hi Waqar.

For internal errors, the best option is always to start a service request with Altera. (log into the my support section of the altera website)

What they will probably ask is an archive of the project (under Project->Archive Project) This will give them your entire design to play with to attempt to reproduce the error.

Once you submit the service request, a thing to try is to delete the DB and Incremental_DB directories from the synthesis directory and try again. Sometimes a corrupt db file will cause issues like this, that just go away when you purge them.

Pete