I don't know if FNT file has strict definition but some hard-to-find errors (even no line number with error) could be eliminated by removing excessive whitespace
1.space in last line
char id=117 x=42 y=101 width=20 height=20 xoffset=0 yoffset=0 xadvance=20 page=0 chnl=15
<---- here one space
BUILD: ERROR: Index 0 out of bounds for length 0
BUILD: ERROR: null
BUILD: WARNING: The launcher icon (30x30) isn't compatible with the specified launcher icon size of the device 'fenix6pro' (40x40). Image will be scaled to the target size.
BUILD: Complete
Aborting launch due to failed build.
2. space inside
char id=107 x=178 y=79 width=19 height=19 xoffset=0 yoffset=4 xadvance=19 page=0 chnl=15
char id=108 x=218 y=99 width=11 height=11 xoffset=0 yoffset=0 xadvance=11 page=0 chnl=15
char id=110 x=84 y=101 width=20 height=20 xoffset=0 yoffset=0 xadvance=20 page=0 chnl=15
BUILD: ERROR: "char" is not a valid key/value pair.
BUILD: ERROR: null
BUILD: WARNING: The launcher icon (30x30) isn't compatible with the specified launcher icon size of the device 'fenix6pro' (40x40). Image will be scaled to the target size.
BUILD: Complete
Aborting launch due to failed build.
3.TAB between values
char id=117 x=42 y=101 width=20 height=20 xoffset=0 yoffset=0 xadvance=20 page=0 chnl=15
^--- here TAB
BUILD: ERROR: null
BUILD: ERROR: null
BUILD: WARNING: The launcher icon (30x30) isn't compatible with the specified launcher icon size of the device 'fenix6pro' (40x40). Image will be scaled to the target size.
BUILD: Complete
Aborting launch due to failed build.
