Codes

Code	Description
1000	You do not have access to the required item
1001	The resource is not assigned to the project specified in the request
1002	The project doesn't contain the parent task ID specified in the request
2000	Can't find one of the requested field
3000	Field value with the type Int cannot be less than described in the method description
3001	Field value with the type Int cannot be more than described in the method description
3002	Field value should be one of the values described in the method description
3003	Length of the field value with the type String cannot be less than described in the method description
3004	Length of the field value with the type String cannot be more than described in the method description
3005	You missed one or a few required fields
3007	Conflict between status and progress in the Create or Update task methods
3008	The resource is already assigned on this task
3010	You cannot create tasks in the "Total estimate" task
3011	Field value should be more than the min value and less than the max value. See min and max values in the method description
3012	In the Create or Update task methods end date can't be earlier than start date
3013	It's not possible to use only end date (without start date or duration) in the Create task method
3014	Based on the working calendar, duration between start date and end date is 0
3015	Unexpected field
3016	One or more resources are not assigned on the task
3017	You can’t change the estimation, duration, or endDate for a milestone
4000	ID is invalid
4001	Field is invalid
4002	Invalid type of field
4003	Date format is invalid
5001	The source task id and the target task id are the same. Choose different tasks to create a link
5002	You can create only one link between two tasks
5003	The source task id and the target task id are from different projects. Choose tasks from the same project
5004	The link is circular