This is a tracking category for CS1 citations that have |asin= errors.
Check |asin= value
When Citation Style 1 and Citation Style 2 templates contain |asin=, a test is done to see if the ASIN identifier contains ten upper-case alphanumeric characters without punctuation or spaces and that if the first character is numeric, that the ASIN conforms to the rules for a ten-digit ISBN.
To resolve this error, ensure that the |asin= value is correct.
If the |asin= value is correct and all-numeric, use |isbn= instead and delete any |asin-tld= parameters.
Pages with this error are automatically placed in Category:CS1 errors: ASIN.