Is not a valid value for the type xsd:double
If you're receiving this error, it is most likely caused by trying to send a non-number value to a Salesforce number field.
To resolve, you should examine which fields on the object are the "double" type in Salesforce and make sure that those fields are receiving the proper value type. Double fields do accept decimal values, but they do not accept non-number values.
To see which types of fields are "double" type, you can look at your Salesforce Schema from within the Salesforce connector (Go to... → Salesforce Objects Reference).
This can also be caused by a required field with a type of xsd:double not being completed on the form.