502 Bad Gateway Error for SimpleJSON Plug In

I am trying to follow a guide to learn grafana with kdb+ (using the SimpleJSON plug in) where basically they give me a simple function and I call it using the f.f[100] query method used for parsing simpleJSON. However, I keep getting a 502 error despite this method being copy and pasted from the website into the file I have (sucessfully) linked.

I tested the function in the test file and it does work as intended. Just for whatever reason, grafana is having a request error. Does anyone possibly know why?

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