i get an error when maxPosts = 6

*Fatal error*: Uncaught exception 'Google_Service_Exception' with message 
'Error calling GET 
https://www.googleapis.com/blogger/v3/blogs/000000?maxPosts=6&key=0000000000: 
(400) We're sorry, but the value for field max_posts was not valid.' in 
C:\xampp\htdocs\xxxxxxxx\google-api-php-client\src\Google\Http\REST.php:111 
Stack trace: #0 
C:\xampp\htdocs\xxxxxx\google-api-php-client\src\Google\Http\REST.php(63): 
Google_Http_REST::decodeHttpResponse(Object(Google_Http_Request), 
Object(Google_Client)) #1 [internal function]: 
Google_Http_REST::doExecute(Object(Google_Client), 
Object(Google_Http_Request)) #2 
C:\xampp\htdocs\xxxxxxx\google-api-php-client\src\Google\Task\Runner.php(172): 
call_user_func_array(Array, Array) #3 
C:\xampp\htdocs\xxxxxxxxxx\google-api-php-client\src\Google\Http\REST.php(47): 
Google_Task_Runner->run() #4 
C:\xampp\htdocs\xxxxxxx\google-api-php-client\src\Google\Client.php(564): 
Google_Http_REST::execute(Object(Google_Client), Object(Google_Ht in 
*C:\xampp\htdocs\xxxxxxx\google-api-php-client\src\Google\Http\REST.php* on 
line 
*111*

*what should i do?*

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