Missing template "layout/theme.liquid"

When I upload the zip file to Shopify I get an error saying "zip does not contain a valid theme: missing template "layout/theme.liquid". How can i fix it?

The package you received from Themeforest has the following items:

• File "Umino_main_official.zip" is the main item that needed to be uploaded to your store to make the theme work correctly without missing template "layout/theme.liquid".

• Folder "Licensing" contains the required license files of Umino theme

• Folder "Demo Preset" contains all the .zip files of all the Umino's homepages. These files is to upload Umino theme to your store

Note*: Before upload Umino theme to your store, please unzip "Package_Umino_v2.x.x" first then upload the "Umino_main_official.zip" file to your Shopify

Folder "Licensing"

Folder "Demo Preset"