templ: Getting multiple error message when parsing a simple templ file

Hi, I have a very simple (copied from the examples) template:

package templates

templ Hello(name string) {
    <div>Hello, { name }</div>
}

Which causes multiple repeating popups when the file in question is in a visible VSCode tab, namely:

[Error - 12:13:45 PM] Request textDocument/hover failed.
  Message: no package metadata for file file:///home/user/Dev/templTest/templates/main.templ
  Code: 0 
[Error - 12:13:46 PM] Request textDocument/semanticTokens/range failed.
  Message: semantictokens are disabled
  Code: 0
[Error - 12:13:46 PM] Request textDocument/semanticTokens/full failed.
  Message: semantictokens are disabled
  Code: 0 
[Error - 12:16:41 PM] Request textDocument/semanticTokens/range failed.
  Message: semantictokens are disabled
  Code: 0 
[Error - 12:16:42 PM] Request textDocument/semanticTokens/full failed.
  Message: semantictokens are disabled
  Code: 0 

These popups happen every time I switch to the template in the editor, and on every change to the templ file in question.

I’ve installed the VSCode extension and the templ cli application.

Can you think of anything I’ve missed that would cause this?