Map2dif_plus errors with Tim Aste's buldings

Hello tried to convert some buildings of Tim's packs (I own all of them) to dif
after making small changes (replacing one texture or removing some spikes from the castle
building) with map2dif_plus.

But will get several errors like:

"Successfully opened map file: sml2_mitGras.map
Parsing mapfile...
Error: Brush 4 - There are bad faces on this brush. This is most likely cause
d by a flat or non-volumetric brush.
Error: Brush 6 - There are missing faces on this brush. This is caused by hav
ing concave edges in the brush.
Error: Brush 7 - There are bad faces on this brush. This is most likely cause
d by a flat or non-volumetric brush.
Error: Brush 9 - There are missing faces on this brush. This is caused by hav
ing concave edges in the brush.
Error: Brush 10 - There are bad faces on this brush. This is most likely caus
ed by a flat or non-volumetric brush.
Error: Brush 12 - There are missing faces on this brush. This is caused by ha
ving concave edges in the brush.
Error: Brush 13 - There are bad faces on this brush. This is most likely caus
ed by a flat or non-volumetric brush.
Error: Brush 15 - This brush was exported improperly with badly formed plane
points. Please validate the brushes in your modelling tool before export.
Error processing entity light Error processing entity light done."


Tried it with 3WDS and CartShop(pipeline) with the same result. What
am I doing wrong?

TIA