303 Google Merchant Center disapproved items

The following issues need solving

Generic image
Unavailable mobile landing page
Unavailable desktop landing page
Mismatched value (page crawl) [price]
Missing value [shipping]
Image too small
Violation of Google policies
Image not retrieved (crawl pending)
Invalid UTF-8 encoding [description]
Missing value [age group]
Missing value [color]
Invalid character encoding [description]
Invalid character encoding [mpn]
Missing value [size]
Image too small
Limited performance due to missing identifiers [gtin, mpn, brand]
Automatic item updates active [availability]
Automatic item updates active [price]
Invalid UTF-8 encoding [mpn]
Value truncated (too long) [title]
Low image quality [image link]
Limited performance due to missing value [gtin]
Limited performance due to missing ISBN or GTIN
Invalid real number [shipping height]
Invalid real number [shipping weight]
Invalid real number [shipping length]
Invalid real number [shipping width]
Invalid price format [sale price]
$25.00