Input could not be converted to a valid request

I’m getting an error message on the activity log every time someone submits the form: “Input could not be converted to a valid request”

More Detail Below
Object: Contact
Trigger: Form Submission

Infusionsoft Response
message: Input could not be converted to a valid request

I’ve submitted my contact info multiple times to test it out, the first error message included additional detail at the bottom of the activity log, which might be helpful.

Search Body {“email”:”[email protected]”}
Search Response{“contacts”:[],”count”:0,”next”:”https:\/\/api.infusionsoft.com\/crm\/rest\/v1\/contacts\/?limit=0&offset=1000&order=id&[email protected]”,”previous”:”https:\/\/api.infusionsoft.com\/crm\/rest\/v1\/contacts\/?limit=1000&offset=0&order=id&[email protected]”}

Please advise on how to fix this! Thank you.