Operation Failed [setting Create Allocation]

Error Message

The Straight Line tool in Spatial Analyst fails with this error when setting Create Allocation:"Operation Failed"

Cause

The Primary Display Field in the 'Distance To' dataset is not a string or integer field.

Solution or Workaround

1. In ArcMap, right-click the 'Distance To' dataset and select Properties.
   
   
2. Switch to the Fields tab and change the 'Primary Display Field' to an integer or string type field.
   
   

   Note:
   This field can not  be floating point type. 

   
   
3. Run the Straight Line tool.