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h2. SymptomWhen calling an Appian Web API using Appian Integration Object, the response is a HTTP 500 error.h2. CauseThis can cause when the request to the Web API is malformed or contains invalid inputs.h2. ActionCheck to make sure that all parameters being passed are valid, and the request body is property cast using the a!toJson() function.h2. Affected VersionThis article applies to Appian 17.2 and later.