Converting image #1
pstoimg: Error: "/usr/bin/pnmcrop -verbose  < /tmp/l2h13686/p13731.pnm | /usr/bin/ppmquant -floyd 256 | /usr/bin/pnmtopng -interlace -trans '#ffffff'  > img7.png" failed: Descriptor de fichero erróneo

Error while converting image

Doing section links ..........

*********** WARNINGS ***********
No implementation found for style `fontenc'
No implementation found for style `graphicx'
couldn't convert character =dot into available encodings

 ...set $ACCENT_IMAGES  to get an image

? brace missing for \psfrag

Done.