error rtrim() in vendor\laravel\framework\src\Illuminate\Foundation\Application.php - laravel

Question

/*When I try to view the output of my project on the browser, I am redirected to the following error
"ErrorException (E_WARNING)rtrim () expects the parameter 1 to be
string, given the object ".
Can someone help me?
*/
i find the problem in following function public function setBasePath($basePath ){
below the code Application.php:
<?php
namespace Illuminate\Foundation;
use Closure;
use RuntimeException;
use Illuminate\Support\Arr;
use Illuminate\Support\Str;
use Illuminate\Http\Request;
use Illuminate\Support\Collection;
use Illuminate\Container\Container;
use Illuminate\Filesystem\Filesystem;
use Illuminate\Log\LogServiceProvider;
use Illuminate\Support\ServiceProvider;
use Illuminate\Events\EventServiceProvider;
use Illuminate\Routing\RoutingServiceProvider;
use Symfony\Component\HttpKernel\HttpKernelInterface;
use Symfony\Component\HttpKernel\Exception\HttpException;
use Illuminate\Contracts\Http\Kernel as HttpKernelContract;
use Illuminate\Foundation\Bootstrap\LoadEnvironmentVariables;
use Symfony\Component\HttpFoundation\Request as SymfonyRequest;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
use Illuminate\Contracts\Foundation\Application as ApplicationContract;
class Application extends Container implements ApplicationContract, HttpKernelInterface
{
/**
* The Laravel framework version.
*
* #var string
*/
const VERSION = '5.6.39';
/**
* The base path for the Laravel installation.
*
* #var string
*/
protected $basePath;
/**
* Indicates if the application has been bootstrapped before.
*
* #var bool
*/
protected $hasBeenBootstrapped = false;
/**
* Indicates if the application has "booted".
*
* #var bool
*/
protected $booted = false;
/**
* The array of booting callbacks.
*
* #var array
*/
protected $bootingCallbacks = [];
/**
* The array of booted callbacks.
*
* #var array
*/
protected $bootedCallbacks = [];
/**
* The array of terminating callbacks.
*
* #var array
*/
protected $terminatingCallbacks = [];
/**
* All of the registered service providers.
*
* #var array
*/
protected $serviceProviders = [];
/**
* The names of the loaded service providers.
*
* #var array
*/
protected $loadedProviders = [];
/**
* The deferred services and their providers.
*
* #var array
*/
protected $deferredServices = [];
/**
* The custom database path defined by the developer.
*
* #var string
*/
protected $databasePath;
/**
* The custom storage path defined by the developer.
*
* #var string
*/
protected $storagePath;
/**
* The custom environment path defined by the developer.
*
* #var string
*/
protected $environmentPath;
/**
* The environment file to load during bootstrapping.
*
* #var string
*/
protected $environmentFile = '.env';
/**
* The application namespace.
*
* #var string
*/
protected $namespace;
/**
* Create a new Illuminate application instance.
*
* #param string|null $basePath
* #return void
*/
public function __construct($basePath = null)
{
if ($basePath) {
$this->setBasePath($basePath);
}
$this->registerBaseBindings();
$this->registerBaseServiceProviders();
$this->registerCoreContainerAliases();
}
/**
* Get the version number of the application.
*
* #return string
*/
public function version()
{
return static::VERSION;
}
/**
* Register the basic bindings into the container.
*
* #return void
*/
protected function registerBaseBindings()
{
static::setInstance($this);
$this->instance('app', $this);
$this->instance(Container::class, $this);
$this->instance(PackageManifest::class, new PackageManifest(
new Filesystem, $this->basePath(), $this->getCachedPackagesPath()
));
}
/**
* Register all of the base service providers.
*
* #return void
*/
protected function registerBaseServiceProviders()
{
$this->register(new EventServiceProvider($this));
$this->register(new LogServiceProvider($this));
$this->register(new RoutingServiceProvider($this));
}
/**
* Run the given array of bootstrap classes.
*
* #param array $bootstrappers
* #return void
*/
public function bootstrapWith(array $bootstrappers)
{
$this->hasBeenBootstrapped = true;
foreach ($bootstrappers as $bootstrapper) {
$this['events']->fire('bootstrapping: '.$bootstrapper, [$this]);
$this->make($bootstrapper)->bootstrap($this);
$this['events']->fire('bootstrapped: '.$bootstrapper, [$this]);
}
}
/**
* Register a callback to run after loading the environment.
*
* #param \Closure $callback
* #return void
*/
public function afterLoadingEnvironment(Closure $callback)
{
return $this->afterBootstrapping(
LoadEnvironmentVariables::class, $callback
);
}
/**
* Register a callback to run before a bootstrapper.
*
* #param string $bootstrapper
* #param \Closure $callback
* #return void
*/
public function beforeBootstrapping($bootstrapper, Closure $callback)
{
$this['events']->listen('bootstrapping: '.$bootstrapper, $callback);
}
/**
* Register a callback to run after a bootstrapper.
*
* #param string $bootstrapper
* #param \Closure $callback
* #return void
*/
public function afterBootstrapping($bootstrapper, Closure $callback)
{
$this['events']->listen('bootstrapped: '.$bootstrapper, $callback);
}
/**
* Determine if the application has been bootstrapped before.
*
* #return bool
*/
public function hasBeenBootstrapped()
{
return $this->hasBeenBootstrapped;
}
/**
* Set the base path for the application.
*
* #param string $basePath
* #return $this
*/
public function setBasePath($basePath )
{
$this->basePath = rtrim($basePath, '\/');
$this->bindPathsInContainer();
return $this;
}
/**
* Bind all of the application paths in the container.
*
* #return void
*/
protected function bindPathsInContainer()
{
$this->instance('path', $this->path());
$this->instance('path.base', $this->basePath());
$this->instance('path.lang', $this->langPath());
$this->instance('path.config', $this->configPath());
$this->instance('path.public', $this->publicPath());
$this->instance('path.storage', $this->storagePath());
$this->instance('path.database', $this->databasePath());
$this->instance('path.resources', $this->resourcePath());
$this->instance('path.bootstrap', $this->bootstrapPath());
}
/**
* Get the path to the application "app" directory.
*
* #param string $path Optionally, a path to append to the app path
* #return string
*/
public function path($path = '')
{
return $this->basePath.DIRECTORY_SEPARATOR.'app'.($path ? DIRECTORY_SEPARATOR.$path : $path);
}
/**
* Get the base path of the Laravel installation.
*
* #param string $path Optionally, a path to append to the base path
* #return string
*/
public function basePath($path = '')
{
return $this->basePath.($path ? DIRECTORY_SEPARATOR.$path : $path);
}
/**
* Get the path to the bootstrap directory.
*
* #param string $path Optionally, a path to append to the bootstrap path
* #return string
*/
public function bootstrapPath($path = '')
{
return $this->basePath.DIRECTORY_SEPARATOR.'bootstrap'.($path ? DIRECTORY_SEPARATOR.$path : $path);
}
/**
* Get the path to the application configuration files.
*
* #param string $path Optionally, a path to append to the config path
* #return string
*/
public function configPath($path = '')
{
return $this->basePath.DIRECTORY_SEPARATOR.'config'.($path ? DIRECTORY_SEPARATOR.$path : $path);
}
/**
* Get the path to the database directory.
*
* #param string $path Optionally, a path to append to the database path
* #return string
*/
public function databasePath($path = '')
{
return ($this->databasePath ?: $thi`enter code here`s->basePath.DIRECTORY_SEPARATOR.'database').($path ? DIRECTORY_SEPARATOR.$path : $path);
}

Answer 1

Can you check you .env for APP_BASE_PATH?
The Application is initialized in bootstrap/app.php file
$app = new Illuminate\Foundation\Application(
$_ENV['APP_BASE_PATH'] ?? dirname(__DIR__)
);
As you can see it looks APP_BASE_PATH environment variable and if this is not set it uses the path to your root application folder.
dirname(__DIR__) returns the path to the parent folder.
Based on the details you posted it looks like the problem can be with the value you set for APP_BASE_PATH
This response assumes you are using the latest version of Laravel, 5.8