validation error

if (!this.isProperties) {

            // Set the validators for the create/update property form
            this.instructionPropertyForm = this.fb.group({
                access_type: [this.accessType, Validators.required],
                address_1: ["", Validators.required],
                address_2: [""],
                town: ["", Validators.required],
                county: [""],
                postcode: ["", [Validators.required, Validators.pattern(/^(GIR 0AA)|((([A-Z][0-9][0-9]?)|(([A-Z][A-HJ-Y][0-9][0-9]?)|(([A-Z][0-9][A-Z])|([A-Z][A-HJ-Y][0-9]?[A-Z])))) [0-9][A-Z]{2})$/)]],
                // capscan_uprn: [""],
                // landmark_uprn: [""],
                longitude: [""],
                latitude: [""],
                key_collect: [""],
                spos: [""],
                keysafe_code: [""],
                key_collect_address_1: [""],
                key_collect_address_2: [""],
                key_collect_postcode: [""],
                access_gained_type: [""],
                occupied: [""],
                tenant_contact_name: [""],
                tenant_contact_phone: [""],
                tenant_contact_mobile: [""],
                tenant_contact_email: [""],
                tenant_contactable: [""],
                boiler_location: [""],
                electric_meter_location: [""],
                water_meter_location: [""],
                gas_meter_location: [""],
                pets: [""],
                loft_access: [""],
                floor_area: [""],
                number_of_bedrooms: ["", Validators.required],
                property_type_id: ["", Validators.required],
                total_rooms: [""],
                property_status: ["", Validators.required],
                customer_type_id: ["", Validators.required],
                vibrant_notes: [""],
                client_notes: [""],
                purchase_order_number: [""],
                order_reference: [""]
            });

        } else {

            // Set the validators for the create/update property form
            this.instructionPropertyForm = this.fb.group({
                address_1: ["", Validators.required],
                address_2: [""],
                town: ["", Validators.required],
                county: [""],
                postcode: ["", [Validators.required, Validators.pattern(/^(GIR 0AA)|((([A-Z][0-9][0-9]?)|(([A-Z][A-HJ-Y][0-9][0-9]?)|(([A-Z][0-9][A-Z])|([A-Z][A-HJ-Y][0-9]?[A-Z])))) [0-9][A-Z]{2})$/)]],
                capscan_uprn: [""],
                landmark_uprn: [""],
                longitude: [""],
                latitude: [""],
                floor_area: [""],
                number_of_bedrooms: [""],
                property_type_id: [""],
                total_rooms: [""],
                // property_status: [""],
                // customer_type_id: [""],
                boiler_location: [""],
                electric_meter_location: [""],
                water_meter_location: [""],
                gas_meter_location: [""],
                pets: [""],
                occupied: [""],
            });

        }