ErrorTwilio error50527: Invalid content variables formatPositive FeedbackNegative FeedbackDescriptiondescription page anchorPositive FeedbackNegative FeedbackAn invalid value was specified for the message content variables Possible causespossible-causes page anchorPositive FeedbackNegative FeedbackContent variables value is invalid JSON object Possible solutionspossible-solutions page anchorPositive FeedbackNegative FeedbackMessage content variables value should be a valid JSON object.