Common errors Amazon

Error: ConditionType for SKU [...] cannot be modified because it has a saleable inventory.

This error occurs when the ConditionType value you submitted for this SKU differs from the exiting ConditionType value in the Amazon catalogue. You cannot change the ConditionType associated with a product while offers for that product are active on Amazon. To resolve this error, you must first remove any existing offers before you can update the ConditionType value.
To resolve this error using tab-delimited inventory files, do the following:
1.           Change the ConditionType in your inventory file for this SKU so that it matches the data from your last successful submission.
2.           Enter "0" (zero) in the quantity column.
3.           Submit your modified inventory file to remove any active offerings from Amazon.
4.           Change the ConditionType in your inventory file for this SKU to your ConditionType.
5.           Enter the correct quantity in the quantity column.
6.           Resubmit your updated inventory file.
To resolve this error using XML feeds, do the following:

1.           Post an inventory feed with a quantity of "0" (zero) for this SKU.
2.           Post your new product data feed.
3.           When your product data feed has processed successfully, post another inventory feed with the correct quantity for your product.
More info:
Seller central help page:
Error:  8571 We have temporarily removed your ability to submit listings (creating new offers or new ASINs) because an unusually high number of listings have been created from your account.
For (semi) new accounts, Amazon has an undisclosed limit for adding new products. Every Sunday this will be reset.