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That was right! The problem comes from matrix code I use without \begin{equation}. Thank u so much!

Hi,

i'm using Texmaker on Mac. Every thing was fine till I copied the pdf file and pasted on desktop then changed its name. When I compiled my work, it showed me "file not found", I deleted the pdf I created on my desktop, but the pdf was in template disappeared :(

I used different Tex editer to ...