我是 Latex 的新手，有人可以帮我吗？

Question

Runaway argument?
\x@protect \[\protect \[  \@nil  \@ifpackageloaded {amstex}{\def \@tempa \ETC.
! Paragraph ended before \@tempa was complete.
<to be read again> 
                   \par 
l.1581 \newenvironment{proof}[1][\proofname]{\par
                   

phd.cls
1581
Paragraph ended before \@tempa was complete.
<to be read again> 
                   \par 
l.1581 \newenvironment{proof}[1][\proofname]{\par

phd.cls

LaTeX Warning: You have requested document class `phd', but the document class provides `amsthm'.