Quartus Pro invalid command name "End-trace" - Quartus Pro invalid command name "End-trace" Hi, Working with Quartus Pro 25.1, we are having the following error when trying to compile: invalid command name "End-trace" while executing "unknown_original End-trace" ("eval" body line 1) invoked from within "eval unknown_original $cmd $args" (procedure "::unknown" line 7) invoked from within "End-trace" invoked from within "flng::run_flow_command -flow "compile"" It hapened suddenly in projects that were compiling flawesly before, we have reproduce this error is different machines. Could you please help us to solve this? Replies: Re: Quartus Pro invalid command name "End-trace" Hi, We have installed the patch and so far seems to work fine again. Thanks for your help! Replies: Re: Quartus Pro invalid command name "End-trace" Does the problem resolved using the patch? Replies: Re: Quartus Pro invalid command name "End-trace" Have you applied the patch: https://community.altera.com/kb/knowledge-base/why-do-i-unexpectedly-observe-intermittent-ddm-errors/349714