I catch ZohoOAuthException

I catch ZohoOAuthException

Hi! I have a problem with my code:

  1. require 'vendor/autoload.php';

  3. ZCRMRestClient::initialize();

  5. try {
  6.   $oAuthClient = ZohoOAuth::getClientInstance();
  7.   $grantToken = '1000.297767e7a02214c5e4432dcc1906f615.c1198106e59644b6539e110f684f4a27';
  8.   $oAuthTokens = $oAuthClient->generateAccessToken($grantToken);
  9. }
  10. catch (ZohoOAuthException $e)
  11. {
  12.   echo $e;
  13. }
result: 
  1. Notice: Undefined offset: 1 in D:\phpProjects\zoho_form\vendor\zohocrm\php-sdk\src\com\zoho\oauth\client\ZohoOAuthClient.php on line 185

  3. Warning: array_key_exists() expects parameter 2 to be array, null given in D:\phpProjects\zoho_form\vendor\zohocrm\php-sdk\src\com\zoho\oauth\client\ZohoOAuthClient.php on line 75
  4. ZohoOAuthException Caused by:'ZohoOAuthException Caused by:'Exception while fetching access token from grant token - ' in D:\phpProjects\zoho_form\vendor\zohocrm\php-sdk\src\com\zoho\oauth\client\ZohoOAuthClient.php(84) #0 D:\phpProjects\zoho_form\index.php(13): ZohoOAuthClient->generateAccessToken('1000.297767e7a0...') #1 {main}' in D:\phpProjects\zoho_form\vendor\zohocrm\php-sdk\src\com\zoho\oauth\client\ZohoOAuthClient.php(89) #0 D:\phpProjects\zoho_form\index.php(13): ZohoOAuthClient->generateAccessToken('1000.297767e7a0...') #1 {main}
oauth_configuration.properties:
  1. client_id=1000.OTCDIJOE18HT67830HKG6N4CJXRBDW
  2. client_secret=69c494c84e52120321ca8f1f0f5ce4cfb6f3973270
  3. redirect_uri=http://127.0.0.1:8080
  4. accounts_url=https://accounts.zoho.eu
  5. token_persistence_path=zcrm_oauthtokens.txt
  6. access_type=offline
  7. persistence_handler_class=ZohoOAuthPersistenceHandler
What am I doing wrong?