Error:

OVER_ASIN_GUIDANCE

Reason:

This means that either you or Amazon has reached the maximum stock quota allowed for this product.
This may be for many reasons out of which one common reason is due to the capacity or other restrictions determined by Amazon's automatic logistics algorithms. 

Resolution:

You can still list this product on other marketplaces, but you could try at another point in time to send this in if it's allowed.