Getting error when executing "addPrescription" function in solidity smart contract

Question

Gas estimation errored with the following message (see below). The transaction execution will likely fail. Do you want to force sending? Error happened while trying to execute a function inside a smart contract.

Got this error when I was trying to execute "addPrescription" function in my solidity smart contract.

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract EHealthManagementSystem {
    
    struct Patient {
        string name;
        uint age;
        address publicAddress;
        string emailAddress;
    }
    
    struct Doctor {
        string name;
        uint age;
        address publicAddress;
        string emailAddress;
    }
    
    struct Prescription {
        string date;
        string prescriptionDetails;
        address doctorPublicAddress;
        string doctorName;
    }
    
    mapping(address => Patient) public patients;
    mapping(address => Doctor) public doctors;
    mapping(address => Prescription[]) public patientPrescriptions;

    address public owner; // Declare the owner address

    modifier onlyDoctor() {
        require(doctors[msg.sender].publicAddress == msg.sender, "Only doctors can execute this function");
        _;
    }
    
    constructor() {
        owner = msg.sender; // The contract deployer is set as the owner in the constructor
    }
    
    function addPatient(string memory name, uint age, address publicAddress, string memory email) public {
        patients[publicAddress] = Patient(name, age, publicAddress, email);
    }
    
    function addDoctor(string memory name, uint age, address publicAddress, string memory email) public {
        doctors[publicAddress] = Doctor(name, age, publicAddress, email);
    }
    
    function addPrescription(address patientAddress, string memory date, string memory prescription, string memory doctorName) public onlyDoctor {
        require(patients[patientAddress].publicAddress == patientAddress, "Patient not found");
        
        Prescription memory newPrescription = Prescription(date, prescription, msg.sender, doctorName);
        patientPrescriptions[patientAddress].push(newPrescription);
    }
    
    function viewMedicalHistory(address patientAddress) public view returns (Prescription[] memory) {
        require(patients[patientAddress].publicAddress == patientAddress, "Patient not found");
        return patientPrescriptions[patientAddress];
    }

    function updatePatientInfo(address patientAddress, string memory newName, uint newAge, string memory newEmail) public {
        require(msg.sender == patientAddress || msg.sender == owner, "You can only update your own information or the contract owner can update any patient's information");
        
        Patient storage patient = patients[patientAddress];
        require(patient.publicAddress != address(0), "Patient not found");
        
        patient.name = newName;
        patient.age = newAge;
        patient.emailAddress = newEmail;
    }
}

The function should work when it is used by doctor only and this function will add prescription to the patient.

Answer 1

Are you testing this on remix? I deployed this contract on test net and the function works well. It is maybe on remix the gas limit or the gas price is a little bit too low. Try change the setting and call the function again.