Could not find rtl_work.TB.vhd

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Well, how do you launch modelsim, i'll do on your way, please help me.

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You can launch Modelsim from the Start Menu. It will be in the folder with your Quartus install.

Once its started do the following;

cd C:/Users/Alfonso/Desktop/PFC

source PFC_run_msim_rtl_vhdl.do

and that will run (source) your script.

If that results in an error, post the messages from the Modelsim console.

Cheers,

Dave