The process or template contains a form field (in either a task form or a launch form) whose field type is Number.
The value submitted for this field must be a string that contains a number, e.g. "123.45".
The value that was submitted for the field is either greater than the maximum of less than the minimum permitted value,
Possible Causes and Suggested Actions
The data in the field is incorrect. It is supposed to be a string that contains a numerical value. The numerical value is too great or too small. The value needs to be replaced with a valid value.