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How to solve DataTables giving a 'Cannot read className of undefined' error

Datatables is an awesome library for making tables useful in HTML.

 

The table I was using did work, and then stopped working. :-(

 

I took a look at the headers and the data. Turns out my headers and my data had some mismatches. I had more column headres than I did columns in my data. This was giving me this error. I fixed the problems with the table colmun headers and all was well!