Actor with this name was not found

I am trying to use an actor with API, I've downloaded the python libray, and copied the code directly from apify to run it, I've updated my api key correctly, but I am getting this error.

run = client.actor("o3cej87hBc3Wf7DN6/wHMoznVs94gOcxcZl").call(run_input=run_input)

From this line, I see the actor is a combination from my userid/actor id
I've checked them both and they're correct, they are copied directly from apify API Client and I still get the error Actor with this name not found
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