diff --git a/src/main/java/org/gcube/portal/oauth/OauthService.java b/src/main/java/org/gcube/portal/oauth/OauthService.java
index 786654d..b183760 100644
--- a/src/main/java/org/gcube/portal/oauth/OauthService.java
+++ b/src/main/java/org/gcube/portal/oauth/OauthService.java
@@ -181,7 +181,7 @@ public class OauthService {
 			if (clientId == null) 
 				credentials = getCredentialFromBasicAuthorization(request);
 			else if (request.getHeader(AUTHORIZATION_HEADER)!=null)
-				throw new Exception("he client MUST NOT use more than one authentication method");
+				throw new Exception("the client MUST NOT use more than one authentication method");
 			
 			logger.info("Params are client_id = " + credentials.getClientId() + ", client_secret = " + credentials.getClientSecret() +
 					"*******************"+ ", redirect_uri = " +redirectUri + ", code = " + code + "*******************" + ", grant_type = " + grantType);