"Calculating mean of several rasters"

[KavinaDayal]

I used Cell Statistics tool to calculate the mean of 30 raster files but I always get the error 999999: error executing function. Can some please tell me why the mathematical operations are not working? I also tried "Raster Calculator" tool to perform similar operation and there it gives me error 000539. I am using ArcGIS 10.5 version.  Attached file contains error information. 

Thanks.

Kavina.

[DanPatterson_Retired]

general error which could mean

• is that type of raster supported
• extents of the rasters aren't the exact same
• you files aren't in the same coordinate system
• you paths are bad (ie spaces and other issues)
• you have nodata values which you haven't dealt with in a way you want

The help topic on cell statistics also list a bunch of Environment options that affect the outcome of the result, these should be explicitly examined in the tools Environment settings to ensure that you have accounted for any of the above and any I have missed.