Issue while trying to get the access token from the OpenEMR

Hi all,
I’ve installed the OpenEMR latest version and I was able to register the client and I’m able to get the grant code. But I’m trying to hit the endpoint to get the access token I’m getting error.

for access token:

Please find the below error code I’m facing,


Notice: Key file “file://C:/xampp/htdocs/openemr/sites/default/documents/certificates/oaprivate.key” permissions are not correct, recommend changing to 600 or 660 instead of 666 in C:\xampp\htdocs\openemr\vendor\league\oauth2-server\src\CryptKey.php on line 74

{

"error": "invalid_request",

"error_description": "Bad request",

"message": "Bad request"

}

Thanks,
Ramanjulu.

I’m missing any request parameter here, or anything related to the file permission or something?