Forest Based Classification and Regression tool Error: Explanatory Variables do not exist.

[HopeHauptman]

I am struggling with preparing data for the Forest Based Classification and Regression (FBCR) tool. I have point/polygon data with buffered contamination sites - that is the predictor variable. The multiple explanatory variables are from raster data but I have joined them in a table together with the point/polygon data. 

So basically my table to run the FBCR tool looks like this (with error message): 

When I run the tool I get an error - Explanatory variable does not exist. Could this be with the way I am naming the variables, the data type (long) or that I should not have joined the variables in the same table?

Can anyone speak to preparing data for the FBCR tool? Thank you for any information. 

[DavidPike · Accepted solution]

Did you make the join permanent by exporting it to a new shapefile/FC?