I haven't been able to exactly duplicate your error message, but I got lines 338 and 580 with the same messages so I think I've gotten fairly close. I managed to get those errors by using the current version of this mod with version 1.0a of Strive. I get no errors when using the most recent version of both.
Viewing post in Chastity Belt Mod v1.3e (for Strive v1.0d)
Like ankmairdor said, looks like you may be using the wrong version of Strive. You need the latest version of Strive (1.0d) for the latest version of this mod.
If you really want to Stay on Strive 1.0a, you can use the version of CB mod for that version
ExpandedSex+ChastityBelt-v1.3.zip: https://mega.nz/file/n00U0SYL#1LYtVkNS2TmndwvZTX-fXHUq2QAeNGVdr2WpWFAIYyY