Lyx time out exporting latexpdf

I have installed Lyx recently. I was able to create a pdf file earlier, but it was giving errors like article.cls file does not exist. Then I uninstalled and reinstalled MikTeX and installed a lot of packages on MikTeX using Admin console. Now, in Lyx it is not giving any error. I have created a document in Lyx. I want the pdf version. If I am exporting as text file or word doc, it’s exporting perfectly, but when exporting as pdflatex, it’s giving timeout. Please help how to resolve this issue.

I can see following log

21:16:18.405: Exporting ...
21:16:18.445: (buffer-export-as)
21:16:18.476: pdflatex  "newfile5.tex"
21:16:19.682: This is pdfTeX, Version 3.14159265-2.6-1.40.21 (MiKTeX 
2.9.7380 64-bit)
21:18:39.076: Automatic save done.supportFileName.cpp (273): Could 
not move file 
C:/xxxxxxxLocal/Temp/lyx_tmpdir.DYaYdLOM7176/lyxautoHp7176.lyx to 
C:/Users/xxxxxxxx/Documents/#newfile5.lyx#
21:20:44.524: Automatic save done.
21:23:39.085: Automatic save done.
21:25:44.537: Automatic save done.
21:28:39.088: Automatic save done.supportSystemcall.cpp (268): 
Systemcall: 'pdflatex  "newfile5.tex"' did not finish!
supportSystemcall.cpp (269): error The process timed out. It might 
be restarted automatically.
supportSystemcall.cpp (270): status The process exited normally.
Error: LaTeX failed
----------------------------------------
The external program
pdflatex 
finished with an error. It is recommended you fix the cause of the 
external program's error (check the logs). 
21:29:02.481: Error while exporting format: pdf2 
C:/Users/xxxxx/Downloads/cc.pdf