PROBLEMS IMPORTING PRODUCTS TO MY ONLINE STORE

PROBLEMS IMPORTING PRODUCTS TO MY ONLINE STORE

I have problems importing products on my Zoho commerce online store as most of the products could not be imported due to the following reasons
1. "product URL should be unique oral B toothbrush already exist". 
2. "invalid value passed for UPC".
3.  "attribute name or option not specified for this row".
HOW DO I SOLVE THESE PROBLEMS?