Pixel Font create tmp asset - invalid_pixel_size

Hey guys,
I was trying to create a tmp asset from this font:

but I get an error:
Font Asset Creator - Error Code [Invalid_Pixel_Size] has occurred trying to load the [lanapixel] font file. This typically results from the use of an incompatible or corrupted font file.

Is it really incompatible or am I missing something?
Would really appreciate help.

I’ll try taking a look at that font file tomorrow but more than likely the font asset creator is correct in its report.