At return "ERROR: text"  "text" contains a error description. Possible errors:

Process errors

• ERROR_$Parameter (parameter not correct)
• ERROR_MISSING_$Parameter (parameter missing) 

• ERROR_MISSING_COMPANY (key for company authentication is missing)
• ERROR_MISSING_SESSIONKEY|VEHICLE|GROUP (there is no parameter given of 3 possibilities)
• ERROR_MISSING_SESSIONKEY (parameter "sessionkey" is missing)
• ERROR_MISSING_VEHICLE (parameter "vehicle" is missing)
• ERROR_MISSING_GROUP (parameter "group" is missing)
• ERROR_MISSING_DISTANCE (parameter "distance" is missing)
• ERROR_MISSING_CYCLE (parameter "cycle" is missing)
• ERROR_MISSING_RADIUS (parameter "radius" is missing)

• ERROR_MISSING_CUSTOMORDERID - own order number is missing
• ERROR_MISSING_ORDERTEXT - order text is missing
• ERROR_ORDER_NUMBER_TOO_LONG(MAX_20_CHARS) - own order number is too long, maximum 20 chars
• ERROR_STREET_TOO_LONG(MAX_100_CHARS) - street name too long, maximum 100 chars
• ERROR_HOUSENUMBER_TOO_LONG(MAX_100_CHARS) - house number too long, maximum 100 chars
• ERROR_ZIPCODE_TOO_LONG(MAX_10_CHARS)- zip code too long, maximum 10 chars
• ERROR_CITY_TOO_LONG(MAX_100_CHARS) - city too long, maximum 100 Zeichen
• ERROR_COUNTRY_TOO_LONG(MAX_100_CHARS) - country too long, maximum 3 chars
• ERROR_LATITUDE_MISSING - latitude value is missing
• ERROR_LONGITUDE_MISSING - longitude value is missing
• ERROR_LATITUDE_NOT_NUMERIC - latitude value must be a number
• ERROR_LONGITUDE_NOT_NUMERIC - longitude value must be a number
• ERROR_LATITUDE_NOT_IN_VALID_RANGE(-90_TO_90) - latitude must be in range of -90 to +90
• ERROR_LONGITUDE_NOT_IN_VALID_RANGE(-90_TO_90) - longitude must be in range of -90 to +90
• ERROR_TARGET_TIME_IS_INVALID - length of given date is not correct
• ERROR_TARGET_TIME_IS_NOT_A_DATE - given date has a wrong format
• ERROR_FORMULAR_NOT_ALLOCATED_BY_VEHICLE - given formular is not assigned to hardware
• ERROR_FORMULAR_NOT_SUPPORTED_BY_HARDWARE - hardware dosn't support orders with attached user defined formulars
• ERROR_ORDER_TEXT_TOO_LONG(MAX_300_CHARS) - order text too long, maximum 300 chars (ATTENTION: Estimated arrival time and adrress are at begin of message at Garmin devices. It reduces maximum number of chars of order text.)

• ERROR_COMPANY (company authentication not correct)
• ERROR_VEHICLE (commited car identification not correct)
• ERROR_GROUP (commited car group not correct)
• ERROR_DISTANCE (parameter "distance" not correct)
• ERROR_CYCLE (parameter "cycle" not ocrrect)
• ERROR_RADIUS (parameter "radius" not correct)

• ERROR_DUPLICATE_CUSTOMORDERID (order number duplicated, action cannot be performed)
• ERROR_ORDER_NOT_FOUND (requested order cannot be located)
• ERROR_TEXT_TOO_LONG (order text and own order number together exceed 350 chars)
  

• ERROR_GROUP_NOMEMBER (the requested car group doesn't contain any car)
• ERROR_MAINTENANCE (currently not available by maintenance reason )

• REQUEST_NOT_FOUND (internal error)

• ERROR_NOT_SUPPORTED_BY_HARDWARE (this action is not supported by hardware of the car)

Server errors

• TIMEDOUT (DB-Timeout (500-100))
• UNKNOWN (unknown error (500-100))
• NOTFOUND (command doesn't found (404))

Pay attention, that all RTI requests never should generate a server error. These kind of requests will deliver a 200 OK in HTTP protocol. If another response code is thrown, it cannot be fixed by debugging of RTI interface logic.