return this.error;
        }

        @Override
        public void error() {
            this.error = true;
        }

        // Setter methods for testing
        public void setGrantedCredits(int grantedCredits) {
            this.grantedCredits = grantedCredits;
        }

        public void setErrorCode(int errorCode) {
            this.errorCode = errorCode;
        }