Everything was working fine last night and then this morning I can't upload any file type of any size.

The following is the error message I get:

<span data-dz-errormessage="">exception 'Concrete\Core\Error\UserMessageException' with message 'Invalid token. Please reload the page and retry.' in /home/skilch5/public_html/concrete/controllers/backend/file.php:193
Stack trace:
[internal function]: Concrete\Controller\Backend\File->upload()
/home/skilch5/public_html/concrete/src/Controller/AbstractController.php(294): call_user_func_array(Array, Array)
/home/skilch5/public_html/concrete/src/Routing/ControllerRouteAction.php(61): Concrete\Core\Controller\AbstractController->runAction('upload', Array)
/home/skilch5/public_html/concrete/src/Http/RouteDispatcher.php(37): Concrete\Core\Routing\ControllerRouteAction->execute(Object(Concrete\Core\Http\Request), Object(Concrete\Core\Routing\Route), Array)
/home/skilch5/public_html/concrete/src/Http/Middleware/DispatcherDelegate.php(39): Concrete\Core\Http\RouteDispatcher->dispatch(Object(Concrete\Core\Http\Request))
/home/skilch5/public_html/concrete/src/Http/Middleware/MiddlewareStack.php(86): Concrete\Core\Http\Middleware\DispatcherDelegate->next(Object(Concrete\Core\Http\Request))
/home/skilch5/public_html/concrete/src/Http/DefaultDispatcher.php(126): Concrete\Core\Http\Middleware\MiddlewareStack->process(Object(Concrete\Core\Http\Request))
/home/skilch5/public_html/concrete/src/Http/DefaultDispatcher.php(58): Concrete\Core\Http\DefaultDispatcher->handleDispatch(Object(Concrete\Core\Http\Request))
/home/skilch5/public_html/concrete/src/Http/Middleware/DispatcherDelegate.php(39): Concrete\Core\Http\DefaultDispatcher->dispatch(Object(Concrete\Core\Http\Request))
/home/skilch5/public_html/concrete/src/Http/Middleware/ThumbnailMiddleware.php(76): Concrete\Core\Http\Middleware\DispatcherDelegate->next(Object(Concrete\Core\Http\Request))
/home/skilch5/public_html/concrete/src/Http/Middleware/MiddlewareDelegate.php(50): Concrete\Core\Http\Middleware\ThumbnailMiddleware->process(Object(Concrete\Core\Http\Request), Object(Concrete\Core\Http\Middleware\DispatcherDelegate))
/home/skilch5/public_html/concrete/src/Http/Middleware/FrameOptionsMiddleware.php(39): Concrete\Core\Http\Middleware\MiddlewareDelegate->next(Object(Concrete\Core\Http\Request))
/home/skilch5/public_html/concrete/src/Http/Middleware/MiddlewareDelegate.php(50): Concrete\Core\Http\Middleware\FrameOptionsMiddleware->process(Object(Concrete\Core\Http\Request), Object(Concrete\Core\Http\Middleware\MiddlewareDelegate))
/home/skilch5/public_html/concrete/src/Http/Middleware/CookieMiddleware.php(35): Concrete\Core\Http\Middleware\MiddlewareDelegate->next(Object(Concrete\Core\Http\Request))
/home/skilch5/public_html/concrete/src/Http/Middleware/MiddlewareDelegate.php(50): Concrete\Core\Http\Middleware\CookieMiddleware->process(Object(Concrete\Core\Http\Request), Object(Concrete\Core\Http\Middleware\MiddlewareDelegate))
/home/skilch5/public_html/concrete/src/Http/Middleware/ApplicationMiddleware.php(29): Concrete\Core\Http\Middleware\MiddlewareDelegate->next(Object(Concrete\Core\Http\Request))
/home/skilch5/public_html/concrete/src/Http/Middleware/MiddlewareDelegate.php(50): Concrete\Core\Http\Middleware\ApplicationMiddleware->process(Object(Concrete\Core\Http\Request), Object(Concrete\Core\Http\Middleware\MiddlewareDelegate))
/home/skilch5/public_html/concrete/src/Http/Middleware/MiddlewareStack.php(86): Concrete\Core\Http\Middleware\MiddlewareDelegate->next(Object(Concrete\Core\Http\Request))
/home/skilch5/public_html/concrete/src/Http/DefaultServer.php(85): Concrete\Core\Http\Middleware\MiddlewareStack->process(Object(Concrete\Core\Http\Request))
/home/skilch5/public_html/concrete/src/Foundation/Runtime/Run/DefaultRunner.php(119): Concrete\Core\Http\DefaultServer->handleRequest(Object(Concrete\Core\Http\Request))
/home/skilch5/public_html/concrete/src/Foundation/Runtime/DefaultRuntime.php(102): Concrete\Core\Foundation\Runtime\Run\DefaultRunner->run()
/home/skilch5/public_html/concrete/dispatcher.php(36): Concrete\Core\Foundation\Runtime\DefaultRuntime->run()
/home/skilch5/public_html/index.php(3): require('/home/skilch5/p...')
#23 {main}</span>

I also saw in a different thread that it could be a caching issue in the .htaccess file so I removed the followed and still nothing:

<IfModule mod_expires.c>
# Enable expirations
ExpiresActive On
# Default directive
ExpiresDefault "access plus 1 month"
# My favicon
ExpiresByType image/x-icon "access plus 1 year”
# Images
ExpiresByType image/gif "access plus 1 month"
ExpiresByType image/png "access plus 1 month"
ExpiresByType image/jpg "access plus 1 month"
ExpiresByType image/jpeg "access plus 1 month"
# CSS
ExpiresByType text/css "access 1 month”
# Javascript
ExpiresByType application/javascript "access plus 1 year"
</IfModule>