Capture vCenter Versions

I'm totally new to datapoints in LM, so hopefully I'm just missing simple. When I add the groovy script above to a new datasource, I get results via "poll now" but they are only in the "Raw Request/Response" section as "Script Output" while "Output" remains a null value. I'm using "content the script writes to the standard output" and a Key value of "auto.vcenter" - Thanks for any insight!

param prefix is not invalid in format - (valid_prefixes=[.], method=namevalue, param=auto.vcenter)

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null

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auto.vcenter.fullname=VMware vCenter Server 6.7.0 build-18831049
auto.vcenter.build=18831049
auto.vcenter.licenseproductname=VMware VirtualCenter Server
auto.vcenter.os.type=linux-x64
auto.vcenter.product.line=vpx
auto.vcenter.version=6.7.0