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I have trouble with assembly file....

Question asked by Bach Nguyen Dinh on Apr 9, 2019
Latest reply on Apr 9, 2019 by John Stoltzfus

Two days ago, I completely finished my assembly file. But today I reopen it and I see a fault "no solution found". Some part have question mark in front of the part's name with a kind of icon. I don't know what's that icon mean.

I really need help right now .. So please .... Thanks in advance