ModelSim Altera Edition v6.4a cannot find certain VHDL configurations in design

Hi,

I have a VHDL design that is aimed at 2 different FPGA families and hence, uses separate architectures and configurations. My design compiles well in Quartus II and works on hardware as well. For testing purposes, I simulate it on ModelSim Altera Starter Edition. However, ModelSim encounters problems when compiling my design.

It gives errors of the type "cannot find expanded name "work.<configuration name>". Specifically, it gives these errors for only those configurations that have "use <library name>.<configuration name>" clauses within them i.e. configuration of configurations. It doesn't have problems with configurations that have only "use <library name>.<entity name>" clauses within them. It didn't have a problem with this before until I had to delete my ModelSim project, create a new one and add all my files to it.

Any help will be appreciated.