How to Add Library Path for Modelsim Altera Starter Edition 10.3d Gate Level Simution

I had a similar problem in which I have been getting error# ** error: (vsim-3033) alstimschem.vo(825): instantiation of 'altera_pll_reconfig_tasks' failed. the design unit was not found. when I have run ModelSim-Altera Starter Edition. I wanted to share details of the problem and solution with the Forum.

I am using schematic entry to create my schematic (.bdf file). I found that I could simulate the program with no problems when I used MegaWizard to create components LPM_MUX, LPM_MULT and LPM_ADD. But when I used MegaWizard to create ALTPLL, Altera_pll or ROM:1-PORT components, I would get the above error messagee for the PLLs when I simulate. If I disconnected the PLL's, simulation of the program with the ROM:1-Port would give# ** error: (vsim-3033) nofile(37): instantiation of 'generic_m10k' failed. the design unit was not found.

I tried adding directories using Tools/Options/Libraries. I tried copying folders and files to folders that I knew the Quartus II and ModelSim was linking to. None of that worked. It is worth mentioning that I could download the program into my Cyclone V Starter Kit and everything would run as programmed. The only problem was with the simulation.

the problem went away when i upgraded my quartus ii web edition from v13.1.0 to v15.0.0. (I did that upgrade a couple of weeks ago. But my compile times were going from 52 seconds to 1 min 11 seconds; therefore I switch back to V13.1.0. Looks like I'm stuck with the slower compile times if I want to simulate. And yes I have the Assignments/Settings/Compiler Settings configured for fastest compiling.)