Fixed error message

src/main/java/org/gcube/gcat/rest/User.java

@@ -87,7 +87,7 @@ public class User extends REST<CKANUser> implements org.gcube.gcat.api.interface
 		if(user.getRoles().contains(Role.MANAGER.getPortalRole())) {
 			CKANUserCache.removeUserFromCache();
 		}else {
-			throw new ForbiddenException("Only " + Role.MANAGER.getCkanRole() + "s are authorized to remove an user from the cache");
+			throw new ForbiddenException("Only " + Role.MANAGER.getPortalRole() + "s are authorized to remove an user from the cache");
 		}
 		return Response.status(Status.NO_CONTENT).build(); 
 	}
@@ -101,7 +101,7 @@ public class User extends REST<CKANUser> implements org.gcube.gcat.api.interface
 		if(user.getRoles().contains(Role.MANAGER.getPortalRole())) {
 			CKANUserCache.removeUserFromCache(username);
 		}else {
-			throw new ForbiddenException("Only " + Role.MANAGER.getCkanRole() + "s are authorized to remove an user from the cache");
+			throw new ForbiddenException("Only " + Role.MANAGER.getPortalRole() + "s are authorized to remove an user from the cache");
 		}
 		return Response.status(Status.NO_CONTENT).build(); 
 	}