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Cascade training error - Empty data folder error

I am using OpenCV 2.4.9 to try and build my own classifier. I am following the instructions on this site:

I was successful in creating a classifier XML file. I went to try an build a new different classifier and ran into the following error:

Training parameters are loaded from the parameter file in data folder! Please empty the data folder if you want to use your own set of parameters

I could not find any parameter file anywhere to empty. When I ran the second time I created a whole new directory structure from the first successful run.

Any help or understanding of how to fix this error?