luigie666,
If you have a 1.8 LCD then you should be converting to 160x120. The best converter to use for this if you are having "Format Error" warnings is version 3.57
HERE and settings to use are
HERE
If your LCD is 1.5 then you should convert to 128x96 for widescreen or 128x128 for fullscreen using 3.68 or 4.03, If you get "Format Error" warning lower the frame rate to medium. If you choose to use 4.03 you need to edit the AmvTransform.ini with notepad and set to CHIPTYPE=0 to unlock the 1.5 settings. You will find AmvTransform.ini in the Amv Converter folder.