001339 : Tool <value> cannot use VB expressions for services.

Description

Tools that use VB expressions, such as Calculate Field, cannot use VB expressions in 64-bit ArcGIS products (ArcGIS for Server, Background Geoprocessing (64-bit), and ArcGIS Runtime).

Solution

You must modify your task to make use of a supported expression type, such as Python.

3/4/2014