Possible mistakes

String expected, got table

The script is not retrieving vehicle data correctly. Check that the data in the database is correct. This usually happens when some data in the "bit_privgarages" table is incorrect.

I cannot park large vehicles such as airplanes

This may be due to the distance between the marker and the distance of your character. You can extend the range in line 23 of the config.lua file:

Config.alertDistance = 2