| General Errors |
| Code | Name | Description |
| 1 | API_VERSION_NOT_SUPPORTED | Version ''{0}'' of the API is not supported. Please consult the documentation. |
| 3 | WRONG_HTTP_METHOD | Wrong HTTP method was used. Please use {0} for this method. |
| 5 | NO_API_KEY | No API key was specified. |
| 7 | INVALID_API_KEY | Cannot find an account with the specified API key. |
| 10 | NO_METHOD | No method was specified. |
| 13 | INVALID_AUTH_TOKEN_KEY | Invalid authToken was used. |
| 15 | AUTH_TOKEN_EXPIRED_KEY | The authToken has expired. |
| 16 | NO_SESSION_TOKEN_KEY | No sessionToken parameter was specified. |
| 17 | INVALID_SESSION_TOKEN_KEY | Invalid sessionToken was used. |
| 19 | SESSION_TOKEN_EXPIRED_KEY | The sessionToken has expired. |
| 20 | NO_SIGNATURE | No signature was specified. |
| 25 | WRONG_SIGNATURE | The signature doesn't match the request parameters. |
| 30 | MISSING_PARAMETER | Parameter {0} is required but is missing. |
| 32 | EMPTY_PARAMETER | Parameter {0} cannot be empty. |
| 35 | INVALID_PARAMETER | Parameter value is not valid. |
| 50 | THEME_NOT_FOUND | The theme you are using was not defined: {0} |
| 60 | ILLEGAL_COMMAND_NAME | Illegal command name: {0} |
| 70 | ILLEGAL_STATE_FOR_COMMAND | Illegal state for command, your current state is ''{0}''. Please refer to the documentation regarding how to get to the correct state. |
| 80 | DATE_MALFORMAT | Dates should use the form mm/dd/yyyy (e.g. 03/24/2008) |
| 83 | DATE_COMPONENT_OUT_OF_RANGE | The {0} component is out of range in the entered date: ''{1}'' |
| 85 | FUTURE_DATE | The entered date occurs in the future: ''{0}'' |
Registration Errors |
| Code | Name | Description |
| 200 | CLIENT_ALREADY_EXISTS | You are trying to register a client that already exists. |
| 210 | CLIENT_DOES_NOT_EXIST | The client does not exist. |
| 220 | ACCOUNT_ALREADY_EXISTS |
System Errors |
| Code | Name | Description |
| 1000 | SYSTEM_ERROR | System Error occured with id: {0} |
AddComment Errors |
| Code | Name | Description |
| 1100 | COMMENT_ID_EXISTS | CommentId ''{0}'' is already in use in the project named ''{1}'' |
AddPhoto Errors |
| Code | Name | Description |
| 1200 | PHOTO_ID_EXISTS | PhotoId ''{0}'' is already in use in the project named ''{1}'' |
Set Dedication Errors |
| Code | Name | Description |
| 1400 | DEDICATION_TOO_LONG | Dedication text cannot be longer than {0} characters. |