Getting Uncaught TypeError calling Web Service

Summary

Error Occurs even though the Webservice brings back data

Content

Hello,

I am getting this error when calling a web service I created that brings data back to vbcs via an OTBI Report. 

---Uncaught TypeError: Cannot read property 'Column0' of null

Integration Cloud calls the SAW Soap Service that gets the OTBI Report and maps the result to the Rest Service that returns the formatted JSON as follows:

{
    "rowset": [
        {
            "Column0": "Duplicate-10002",
            "Column1": "2019-01-05",
            "Column2": "Invoice is missing invoice lines and needs completion.",
            "Column3": "2019-01-09",
            "Column4": "1",
            "Column5": "SYSTEM",
            "Column6": "250",
            "Column7": "Federal Supplier"
        },
        {
            "Column0": "FS-100002",

... and so forth.