invalid_grant and Bad Request

Hi,

I have a error for adwords api but I didn't understand and I didn't solve. Error in the down. Please, Can you help me? Thanks.

(Note: My server is localhost and my acount is testing.)

Fatal error: Uncaught exception 'OAuth2Exception' with message '{ "error": "invalid_grant", "error_description": "Bad Request" } ' in C:\xampp\htdocs\googleads-php-lib-master\googleads-php-lib-master\src\Google\Api\Ads\Common\Util\SimpleOAuth2Handler.php:118 Stack trace: #0 C:\xampp\htdocs\googleads-php-lib-master\googleads-php-lib-master\src\Google\Api\Ads\Common\Util\SimpleOAuth2Handler.php(92): SimpleOAuth2Handler->MakeRequest('https://www.goo...', Array) #1 C:\xampp\htdocs\googleads-php-lib-master\googleads-php-lib-master\src\Google\Api\Ads\Common\Util\OAuth2Handler.php(105): SimpleOAuth2Handler->RefreshAccessToken(Array) #2 C:\xampp\htdocs\googleads-php-lib-master\googleads-php-lib-master\src\Google\Api\Ads\Common\Lib\AdsSoapClient.php(452): OAuth2Handler->GetOrRefreshAccessToken(Array) #3 C:\xampp\htdocs\googleads-php-lib-master\googleads-php-lib-master\src\Google\Api\Ads\Common\Lib\AdsSoapClient.php(199): AdsSoapClient->GenerateHttpHeaders() #4 C:\xampp\htdocs\googleads-php-lib-master\googleads-php-lib-master\src inC:\xampp\htdocs\googleads-php-lib-master\googleads-php-lib-master\src\Google\Api\Ads\Common\Util\SimpleOAuth2Handler.php on line 118

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