Taxiway:(Blank) shouldn't cause the problem.
A common reason for this behavior is 'broken' taxi routes, i.e., the parking spot is not connected to the departure runway.
In AFX, run the Fault Finder (in the Tools menu). It should tell you if there are any unconnected links or other problems.
Edit: downloaded '1LFBH_La_Rochellev2FS9.zip'. If that's the same file: The Afcad (AF2_LFBH,bgl) is a total wreck. Few, if any, of the parking spots are connected, and there are dozens of other errors and omissions that will keep ai from departing.
Last edited by dave3cu
on Thu Jan 28, 2010 7:13 am, edited 1 time in total.
At that time  the chief engineer was almost always the chief test pilot as well. That had the fortunate result of eliminating poor engineering early in aviation.