can't add script behaviour callbackexecutor the script needs to derive from monobehaviour

Unity Engine
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6079707--659700--upload_2020-7-11_14-56-36.png

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What part of this error don’t you understand? Have you considered googling it?

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already researched but found nothing that solved my problem

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Does your script derive from MonoBehavior?

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yes

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Mind sharing the code?