I have difficulties to make a document in LyX. I have create my document in TexMaker (LaTeX) and I want to put this codes in LyX editor and see the result as a PDF or DVI. but it seem some errors while the compilation in LyX. The package is already complete. No missing package. Any suggestions?
Correct me if I'm wrong, but it seems you just want to get a PDF for your LaTeX document. If so, I would skip LyX altogether and just use pdflatex. As Charles pointed out, converting from LaTeX to LyX is tricky under the best circumstances. You seem to have a fairly complicated document, so I'm not surprised that this failed. What is your motivation for moving to LyX?
If you really want to convert to LyX, try removing the child documents before the conversion, and adding the \include tex afterwards from within Lyx. Can you give us more info about the actual error?