Plugin Filename * Is Invalid
The mentioned season or swap INI file contains an invalid plugin filename at the given line number.
For example, the invalid plugin filename is missing the .ESM, .ESL or .ESP.
For example, note the first Skyrim missing the .ESM:
Edit the INI file in notepad and correct the plugin filename.
See Base Object Swapper and Seasons for more.
Notify the mod author.