show Call to undefined function setActive() error in laravel 6.3 - laravel

URL or Route setActive() method is not working in laravel 6.3. It shows the following error :
Call to undefined function setActive()

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Call to undefined method Illuminate\View\Compilers\BladeCompiler::component()/

I have tried to create a Blade component in laravel 5.6. I have added this code segment Blade::component('front.components.filter','filter'); in AppServiceProvider.php and add this in my blade file
#filter #endfilter
when I try to run the program I have got this error
Call to undefined method Illuminate\View\Compilers\BladeCompiler::component()/
How can I fix this?

PHP Warning throws ErrorException

A unit test is failing because an ErrorException about an undefined property is thrown. However, this happens in a connected shop system's core files which i cannot change.
My controller has a try ... catch block that catches the generic Exception object. But i don't want that catch to fire because of an undefined property.
I figured out the error is converted to an ErrorException in HandleExceptions.php in method handleError
How can i make phpunit ignore notices and warnings coming from code pieces i can't touch?
What i've already tried
In phpunit.xml
convertErrorsToExceptions="false"
convertNoticesToExceptions="false"
convertWarningsToExceptions="false"
Set APP_DEBUG=false as well as API_DEBUG=false for dingo.
I am using Dingo 1.0.x with Laravel 5.4 and phpunit 5.7.26.

Call to undefined method Modules\User\Services\web\facade\WebAuth::loginUsername()

I am using laravel ThrottlesLogins in my custom facade class as trait. I am using
if($this->hasTooManyLoginAttempts($request))
return $this->ThrottleActions($request);
in my login method, but why I am facing the subject error
Call to undefined method Modules\User\Services\web\facade\WebAuth::loginUsername()
However on local its working fine. But when I update code online server. I am facing this error.
This method loginUsername() already exist in ThrottlesLogins trait.

STRAVA – OAUTH2 of laravel, error

After using STRAVA – OAUTH2 of laravel, I am getting following error. Could anyone help me on this
ErrorException in StravaController.php line 27:
Undefined property: App\Http\Controllers\Api\v1\StravaController::$app
This error occured when provided this line of code inside the function and before the Socialite method
$key = 'SocialiteProviders.config.strava';
$config = new \SocialiteProviders\Manager\Config('key', 'secret', 'callbackUri');
$this->app->instance($key, $config)
You have to create an strava library object called app with client id and client secret. Then you can call the instance.

Call to undefined method VirtueMartControllerInvoice::getInvoicePDF()

i'm using joomla 2.5.11 and virtuemart 2.0.26a
getting a error in virtuemart when a order is changed to Confrimed Status..
Call to undefined method VirtueMartControllerInvoice::getInvoicePDF()
sometimes i'm getting
500: Internal Server Error
but when the order status is changed to Pending or something else..And mail to client is delivered without PDF.

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