Troubleshooting

Multiple versions of prosemirror packages

RangeError: Can not convert <> to a Fragment (looks like multiple versions of prosemirror-model were loaded)

This error, or similar errors like Adding different instances of a keyed plugin, happens when more than one copy of a prosemirror package is installed. ProseMirror relies on instanceof checks, so objects created by one copy are rejected by the other.

Check for duplicate versions:

npm ls prosemirror-model prosemirror-state prosemirror-view

If more than one version is listed, deduplicate them:

npm dedupe

If that doesn’t help, delete node_modules and the lockfile and install again.

When another dependency needs a different version, force a single version with overrides for npm or resolutions for yarn. The version should satisfy the range required by ngx-editor.

{
  "overrides": {
    "prosemirror-model": "^1.25.12"
  }
}

If you install prosemirror packages directly in your app, use versions compatible with the ones ngx-editor depends on.