Error after theme update

I have just hit the update button in Minos theme. Now I do get the following error:
rror: Error building site: failed to render pages: render of “home” failed: “layouts/index.html:64:5”: execute of template failed: template: index.html:64:5: executing “main” at <partial “post-item.html” .>: error calling partial: partial “post-item.html” not found

Sorry, I am a non-developer. What can I do to resolve it? Thanks a lot.

Did you ever customize that theme yourself? Based on what I see for that theme (theme-minos/layouts/index.html at master · microdotblog/theme-minos · GitHub), there is no use of post-item.