180838: Output raster name <value> contains invalid characters or uses an unsupported extension.

Description

The specified output raster name is not valid.

Try the following:

To save a raster file, ensure that the target location is a folder (not a geodatabase) and that the file name includes either the .tif or .png file extension.
To save a geodatabase raster, select a geodatabase as the target location and ensure that the raster name does not include any extension.