[mrtg] Upgrade MRTG problem

[von dan]

I upgraded MRTG 2.9.17 to 2.9.29. When my script run, i get an error message. Any clues to fix this?
 
gd-png:  fatal libpng error: Invalid filter type specified
gd-png error: setjmp returns error condition
gd-png:  fatal libpng error: Invalid filter type specified
gd-png error: setjmp returns error condition
gd-png:  fatal libpng error: Invalid filter type specified
gd-png error: setjmp returns error condition

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