Description:
Invalid [weight_unit] : '...'
This means you left the weight_unit column blank or entered an invalid entry.
Solution:
Make sure you have entered a valid weight unit into the weight_unit column.
Valid units are:
oz
lb
g
kg
Note: If your weights are not being imported into Etsy visit the Product weights not imported to Etsy article.
For more information on weigh_unit visit the documentation page.