Pixel technical issue (Yellow triangle error)

I have a question related to my Pixel install. I am sure that I just copied and pasted from Ad Manager to my Tumblr but it shows me this error. May you help me with this?

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@AmyHu189 I just had this issue with a client about a week ago. The pixel was activated and this still appeared and the n mysteriously disappeared. We believe it to be an FB glitch.

Check that your pixel is activated. Look at your FB dashboard to see if there is data in the overview. If so then the pixel is firing.