I have been working on a project management tool. I created a mongoose schema for the Project. But when I test it using Postman it throws an error. I tried almost everything and spent hours debugging but all in vain. Here is the exact error:
Project validation failed: tasks: Cast to [undefined] failed for value "[]" (type string) at path "tasks.0" because of "TypeError

I have tried almost everything. May be I missed something but i spent hours but nothing worked out for me. 1. When I removed both collaborators and tasks array it worked fine
2. I have used and define schema directly in this file like this:
tasks: [taskSchema]
but that time i encounter another error
cannot read properties of undefined (reading 'length') mongoose

Please help me how can i get a away with these errors. I am using mongoose version ^8.3.2.

Below are my files:

Project.model.js:

const projectSchema = mongoose.Schema(
  {
    user: {
      type: mongoose.Schema.Types.ObjectId,
      ref: 'User',
      required: true,
    },
    title: {
      type: String,
      required: true,
    },
    description: {
      type: String,
      required: true,
    },
    collaborators: [
      {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'User',
      },
     permissions: {
          type: String,
          enum: ['read', 'write', 'admin'],
          default: 'read',
        },
    ],
    tasks: [
      {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'Task',
      },
    ],
  },
  {
    timestamps: true,
  },
);
const Project = mongoose.model('Project', projectSchema);

module.exports = Project;

project.controller.js:
const createProject = catchAsync(async (req, res) => {
  const project = await projectService.createProject(req.body, req.user.id);
  res.status(httpStatus.CREATED).json(project);
});

services.js:
const createProject = async (projectBody, userId) => {
  const project = await Project.create({ ...projectBody, user: userId });
  return project;
};````