010876: Input raster values cannot be negative.
Description
When the Overlay Method parameter value is set to the Weighted geometric mean option, no cells in the input raster can have negative values. Since the calculation multiplies the values and takes roots, having negative values would produce invalid results.
Solution
All input rasters should be reclassified or rescaled to a common suitability (preference) scale to be used as the input raster for the tool. Ensure that there are no cells in the input raster with a negative value.