The plugin generated 1616 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.

The most common causes are:

1. A white space before or after the PHP opening or closing tags
2. A file encoded in UTF-8
3. Another issue when something is called at the wrong time, or a call that cannot be resolved without intervention
4. Using the WordPress add_option function. Switching to update_option instead can resolve the problem.

If the first two causes have been eliminated, and the problem persists then this issue needs to be tracked down and eliminated, otherwise it might cause problems. To save the error message to debug the problem the following code snippets can help:

The Plugin Generated x Characters of Unexpected Output During Activation