[O] org mode error "pdf wasn't produced"

[Dereje Tefera]

Dear good team of Org-mode,

I am using org-mode in the Emacs, but I have a problem exporting to Latex,  PDF.

"I always have this message that says, PDF was not produced, when i try to export to latex pdf. 

I can export to HTML or tet latex but not to pdf. 

Any help would be highly appreciated.

Thank you for your time.

Regards

Dereje