The plugin generated XXX characters of unexpected output…help?

I solved it. This line:

"if (!isset($pd_plugin_instance)) $pd_plugin_instance = new Products();"

Was causing all the error. I removed the Widget section from the plugin but forgot to remove it. After removing it, the error was gone.

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)