000357 : End type option is invalid with the ArcGIS for Desktop Basic or ArcGIS for Desktop Standard license.
Description
Buffer's End type parameter can be used only with an ArcInfo license. Specifying FLAT will fail with an ArcView or ArcEditor license.
Solution
To use Buffer's End type parameter, an ArcInfo license is necessary. If using an ArcView or ArcEditor license, you only have the option of setting a ROUND end type.
3/4/2014