Oracle Message PCB-00633 - Invalid host variable and attribute pairing

ERRORInvalid host variable and attribute pairing
CAUSEThe host variable and attribute pairing in a LOB DESCRIBE was invalid. Most likely, this was due to some problem with the host variable. For example, this error could occur if the host variable was not declared.
ACTIONUsually, other, more specific, errors will accompany this one. Correcting some or all of those problems should resolve this error.