This error occurs when value for the system description is not given. %s '%s' - System description type 'System description name'.
Ensure the system definitions are complete.
Example
[System: UDF]
MyUDF
In the above example, the system UDF MyUDF is not defined completely. Hence the message error T0031: The value of system UDF 'MyUDF' is empty.
The code is corrected by adding values to the system description, MyUDF.
[System: UDF]
MyUDF: String : 37115