I've definitely seen this before, on the YT Help forum.
You won't be able to link your channel, but give me its name and I will most likely be able to tell you what is wrong. There is very little hope to get monetization back, however; as this message means that you have violated the YouTube Partner Program Policies by submitting media which you either didn't own the rights to, or violated the Advertiser-Friendly Guidelines with your videos and so became ineligible for monetization. Your only path here, would be to start over with a fresh batch of content.