Laravel No Message Symfony Component HttpKernel Exception MethodNotAllowedHttpException - development

Laravel No Message Symfony Component HttpKernel Exception MethodNotAllowedHttpException

When i edit my projects it give me this error . please help . im stuck. how do i know where is the error. then maybe i can fix it.

This is my edit.blade.php

<form method="post" action="">

/datas/

<div class="form-group">
<input type="submit" class="btn btn-primary" value="Submit"/>
</div>

ProjectController

public function update($id, Request $request)
 {
    $this->validate($request, [
        'company_id' => 'required',
        'position_id' =>  'required',
        'bner' =>  'required',
        'poz_id' =>  'required',
        'hner' =>  'required',
        'document_id' =>  'required',
        'bbner' =>  'required',
        'ddate' =>  'required',
        'bdugaar' =>  'required',
        'batalgaatdate' =>  'required',
        'version' =>  'required',
        'burtgel' =>  'required',
        'aner' => 'required',
        'adugaar' => 'required',
        'batlagdsan' =>  'required',
        'batdate' => 'required',
        'btushaal' =>  'required',
        'date' =>  'required',
    ]);
        $postData = $request->all();
        Post::find($id)->update($postData);
        Session::flash('success_msg', 'Project updated successfully!');
        return redirect()->route('projects.index');
 }

web.php

Route::get('/projects/edit/{id}','ProjectsController@edit')->name('projects.edit');

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