i have a problem with activation plugin "unexpected output during activation"

[Baxo]

The plugin generated 244 characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.

 

[Victoria Kudryashova]

The plugin generated 244 characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.

Hello, can you attach a screenshot please?

 

[Baxo]

Screenshots

 

[Victoria Kudryashova]

Screenshots

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