Trying to empty the content of a Firestore table via Dart code not working.

// Automatic FlutterFlow imports
import '/backend/backend.dart';
import '/backend/supabase/supabase.dart';
import '/flutter_flow/flutter_flow_theme.dart';
import '/flutter_flow/flutter_flow_util.dart';
import '/custom_code/actions/index.dart'; // Imports other custom actions
import '/flutter_flow/custom_functions.dart'; // Imports custom functions
import 'package:flutter/material.dart';
// Begin custom action code
// DO NOT REMOVE OR MODIFY THE CODE ABOVE!

// Set your action name, define your arguments and return parameter,
// and then add the boilerplate code using the green button on the right!

import 'package:cloud_firestore/cloud_firestore.dart';

Future<void> deleteCollection(String collectionPath) async {
  debugPrint('DELETE COLLECTION I GET HERE');
  final collection = FirebaseFirestore.instance.collection(collectionPath);
  debugPrint('COLLECTION: $collection');
  final snapshots = await collection.get();
  debugPrint('SNAPSHOTS: $snapshots');

  for (var doc in snapshots.docs) {
    debugPrint('DOC IS: $doc');
    String docReference = doc.reference;
    debugPrint('Doc reference: $docReference');
    await doc.reference.delete();
    debugPrint('Deleted doc I get here');
  }
}

dart_sdk.js:12007 Uncaught (in promise) Error
    at Object.createErrorWithStack (dart_sdk.js:12007:12)
    at Error._throw (dart_sdk.js:13480:18)
    at Error.throwWithStackTrace (dart_sdk.js:13477:18)
    at async._AsyncCallbackEntry.new.callback (dart_sdk.js:47537:18)
    at Object._microtaskLoop (dart_sdk.js:47394:13)
    at _startMicrotaskLoop (dart_sdk.js:47400:13)
    at dart_sdk.js:43200:9



POST https://firestore.googleapis.com/google.firestore.v1.Firestore/Write/channel?VER=8&database=projects%2Fprojectname%2Fdatabases%2F(default)&gsessionid=p-Q9wXAl33dnyBpFpR7rzArEPT0hhHetYwMDZ6ipKhM&SID=fdIBs7XFmR44XmeuCqGNeA&RID=70105&TYPE=terminate&zx=hpb16eatrlh5 400 (Bad Request)