MySQL - Trying to update existing prices and sizes in products table

Hi all, I am having trouble trying to get a MySQL query to run. I am getting errors and I'm hoping somebody can advise me.

I have a table of products (ps_4products), and a table of up-to-date prices and sizes (_import_products). I am trying to replace some old content in the table ps4_products with up-to-date content in the _import_products table, but I am getting errors.

I am trying to ask the DB to match on ProductSKU and then replace the relevant info but I am getting this error:

Not unique table/alias: 'ps4_products'

I have no idea what it means though. Please advise where the error in my code is.

Here's my query:

SELECT ProductSku, COUNT(ProductSku) _import_products FROM _import_products

GROUP BY ProductSku;

UPDATE ps4_products

INNER JOIN ps4_products ON (_import_products.ProductSku = ps4_products.ProductSKU)

SET ps4_products.ProductPrice = _import_products.ProductPrice;

SET ps4_products.ProductWeight = _import_products.ProductWeight;

SET ps4_products.ProductWidth = _import_products.ProductWidth;

SET ps4_products.ProductHeight = _import_products.ProductHeight;

SET ps4_products.ProductLength = _import_products.ProductLength;

Thanks

Mat