Raster Calculator - Error 000539: Error running expression

[AnnaBarnett]

I'm trying to simply combine 5 different rasters in raster calculator to do a site suitability analysis but I keep getting this error message:

The day before I completed the same process with the same data but different rankings and it worked:

Any help would be appreciated! I've worked on this for hours trying all different things but I still can't figure it out.

[AdrianWelsh]

Anna,

Take a look at this Esri technical support document on this error. It lists a workaround:

Error: ERROR 000539: Error running expression: rcexec() 

[DanPatterson_Retired]

Try the Plus tool in the spatial analyst rather than the raster calculator.

Also, your grid names are quite long which could be an issue.

Also you didn't access the raster calculator from the same location, since the interface in the report is different.

[AbdullahAnter]

Run your process again in background processing Foreground and background processing—Help | ArcGIS for Desktop 

[DanPatterson_Retired]

Anna.... solved? or still not working?