Unable to upload an image in laravel 7 - php

Question

Using Laravel 7, I'm tring to setup a form where a user can edit their details and their image. While trying to upload a PNG or JPG image, I get the following Validation Error:
The image must be an image.
If I try to upload image, I get this error
Call to a member function isvalid() on boolean
And If I remove the validation for image, I get a FatalErrorException:
Call to a member function getClientOriginalExtension() on boolean
which is a helper function provided by Intervention/Image library. This could mean that the image didn't upload at all.
This is my Blade file
1. form role="form" id="updateDetailsForm" method="post" action="{{url('/admin/update-admin-details')}}" enctype="multipart/form-data">
                <div class="card-body">
                <div class="form-group" >
                    <label for="exampleInputEmail1">Admin Name</label>
                    <input type="text" class="form-control" name="admin_name" id="name"  value="{{Auth::guard('admin')->user()->name}}" placeholder="Enter Email">
                  </div>
                  <div class="form-group">
                    <label for="exampleInputEmail1">Type</label>
                    <input type="text" class="form-control" name="type" id="type" readonly value="{{Auth::guard('admin')->user()->type}}" placeholder="Enter Email">
                  </div>
                  <div class="form-group">
                    <label for="exampleInputEmail1">Email address</label>
                    <input type="email" class="form-control" name="email" id="email" readonly value="{{Auth::guard('admin')->user()->email}}" placeholder="Enter Email">
                  </div>
                  <div class="form-group">
                    <label for="exampleInputEmail1">Mobile</label>
                    <input type="text" class="form-control" name="mobile" id="mobile"  value="{{Auth::guard('admin')->user()->mobile}}" placeholder="Enter Email">
                  </div>
                  <div class="form-group">
                    <label for="exampleInputPassword1">Image</label>
                    <input type="file" class="form-control" name="admin_image" id="admin_image" accept="image/*"  >
                    #if(!empty(Auth::guard('admin')->user()->image))
                    <a target="_blank" href="{{url('/images/admin_images/admin_photos/'.Auth::guard('admin')->user()->image)}}">View Image</a>
                    <input type="hidden" name="current_admin_image" value="{{Auth::guard('admin')->user()->image}}">
                     #endif
                </div> ```
This is my Controller
```ADMIN CONTROLLER
public function updateAdminDetails(Request $request){
        if($request->isMethod('post')){
            $data= $request->all();
            //echo "<pre>";print_r($data);die;
            //Creating Validation
        $rules =[
            'admin_name'=>'required|string',
            'mobile'=> 'required|numeric',
            'admin_image'=> 'required|image|file',
           
        ];
        $customMessage=[
            'admin_name.required'=>'Name is Required',
            'admin_name.alpha' => 'Valid Name is required',
            'mobile.required'=>'Mobile is Required',
            'mobile.numeric'=>'Valid Mobile is Required',
           'admin_image.required'=>'Image is Required',
           'admin_image.image'=>'Valid Image is Required',
        ];
        $this->validate($request, $rules, $customMessage);
        //Uploading Admin Image
       // $imageName= '';
        if($request->hasFile('admin_image')){
            $image_tmp = $request->hasFile('admin_image');
            if($image_tmp->isValid()){
               
                //get extension
                $extension = $image_tmp->getClientOriginalExtension();
              
                //Generating image name
                $imageName= rand(111,999999).'.'.$extension;
                //Image Path
                $imagePath= 'images/admin_images/admin_photos/'.$imageName;
                //Uploading the image
                Image::make($image_tmp)->save($imagePath);
            } 
            }  else{
               $imageName="";
                //return false;
            }
        
        
        $result=Admin::where('email', Auth::guard('admin')->user()->email)
        ->update(['name'=>$data['admin_name'], 'mobile'=>$data['mobile'], 'image'=>$imageName]);
        
            //echo "<pre>";print_r($result);die;
        //Session::flash('success_message', 'Details updated Successfully');
        return redirect()->back();
        }
        return view('admin.admin_details');
    }
Thanks, bosses