Conversion Tools ⇒ Font Error during 'dvipdf' Conversion

[Minero]

Hello,

I'm having a problem when converting my dvi file to pdf.
The conversion of the tex file to dvi it's ok. But when I type

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# dvipdf thesis.dvi

I got the following message:

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dvips: Font ecbx1440 at 8000 not found; scaling 600 instead.
dvips: Such scaling will generate extremely poor output.    
dvips: Font ecrm1440 at 8000 not found; scaling 600 instead.
dvips: Font ecrm1200 at 8000 not found; scaling 600 instead.
dvips: Font ecbx2488 at 8000 not found; scaling 600 instead.
dvips: Font ecsi2488 at 8000 not found; scaling 600 instead.
dvips: Font ecti1200 at 8000 not found; scaling 600 instead.
dvips: Font ecbx1200 at 8000 not found; scaling 600 instead.
dvips: Font ecss1095 at 8000 not found; scaling 600 instead.
dvips: Font ecsi1095 at 8000 not found; scaling 600 instead.
dvips: Font eccc1728 at 8000 not found; scaling 600 instead.
dvips: Font ecsx1728 at 8000 not found; scaling 600 instead.
dvips: Font ecsx1440 at 8000 not found; scaling 600 instead.
dvips: Font ecsx1200 at 8000 not found; scaling 600 instead.
dvips: Font ecrm1000 at 8000 not found; scaling 600 instead.
Error: /undefined in 010101010101FBFBFB010101020202000000010101000000000000000000000000000000000000
Operand stack:                                                                                     
   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0
Execution stack:
   %interp_exit   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   --nostringval--   --nostringval--   false   1   %stopped_push   1862   1   3   %oparray_pop   1861   1   3   %oparray_pop   1845   1   3   %oparray_pop   1739   1   3   %oparray_pop   --nostringval--   %errorexec_pop   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--
Dictionary stack:
   --dict:1149/1684(ro)(G)--   --dict:0/20(G)--   --dict:83/200(L)--   --dict:209/300(L)--   --dict:50/200(L)--   --dict:83/200(L)--
Current allocation mode is local
Last OS error: 2
GPL Ghostscript 8.70: Unrecoverable error, exit code 1

I'm lost! How can I overcome this error? What it can be?

Thanks!!!