sveltekit:doesn't appear to be written in CJS

Hi Kopiro,
after installing it on my project it throws this error:
siriwave doesn't appear to be written in CJS, but also doesn't appear to be a valid ES module (i.e. it doesn't have "type": "module" or an .mjs extension for the entry point). Please contact the package author to fix.

If you have encountered this problem before please let me know how you fixed it...