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