010208 : The PRJ of grid <value> does not match.

Description

The projection of the grid does not match the others. When creating a grid stack, the input grids ordinarily all need to be the same coordinate system. Note that if an input does not have a coordinate system defined, it will be assumed to be the same projection as that defined in the other inputs.

Solution

Make sure that all your inputs have the same coordinate system. You can use Project Raster to project the raster to that of the other datasets.