Hi, I'm trying to implement auto creation trigger of contacts for all incoming email to case emails. It should auto create the contact if the contact is not in our system.

The auto creation features works in sandbox and production. However, our agents are not allowed to create a new case in production. Does anyone know why I am getting this error? Thank you for your help!

Here is the error message when creating a new case:


Here is the code we used:

trigger TriggertoCreateContactformCase on Case (before insert) {
    List<String> UseremailAddresses = new List<String>();
    //First exclude any cases where the contact is set
    for (Case c:Trigger.new) {
        if (c.ContactId==null &&
            c.SuppliedEmail!=''|| c.SuppliedEmail==null)
        {
            UseremailAddresses.add(c.SuppliedEmail);
        }
    }

    //Now we have a nice list of all the email addresses.  Let's query on it and see how many contacts already exist.
    List<Contact> listofallContacts = [Select Id,Email From Contact Where Email in:UseremailAddresses];
    Set<String> ExstingEmails = new Set<String>();
    for (Contact c:listofallContacts) {
        ExstingEmails.add(c.Email);
    }
    
    Map<String,Contact> emailToContactMap = new Map<String,Contact>();
    List<Case> casesToUpdate = new List<Case>();

    for (Case c:Trigger.new) {
        if (c.ContactId==null &&
            c.SuppliedName!=null &&
            c.SuppliedEmail!=null &&
            c.SuppliedName!='' &&
           !c.SuppliedName.contains('@') &&
            c.SuppliedEmail!='' &&
           !ExstingEmails.contains(c.SuppliedEmail))
        {
            //The case was created with a null contact
            //Let's make a contact for it
            String[] Emailheader = c.SuppliedName.split(' ',2);
            if (Emailheader.size() == 2)
            {
                Contact conts = new Contact(FirstName=Emailheader[0],
                                            LastName=Emailheader[1],
                                            Email=c.SuppliedEmail
                                            );
                emailToContactMap.put(c.SuppliedEmail,conts);
                casesToUpdate.add(c);
            }
        }
    }
    
    List<Contact> newContacts = emailToContactMap.values();
    insert newContacts;
    
    for (Case c:casesToUpdate) {
        Contact newContact = emailToContactMap.get(c.SuppliedEmail);
        
        c.ContactId = newContact.Id;
    }
}

Here is the Apex class we used:
 

@isTest
public class Test_CreateContactFormCase {
    
     static TestMethod  void createData()
     {
           contact c = new contact(FirstName='test',LastName='contact94',Email='abctest@123.com'); 
           insert c;
            case cse1 = new case(subject='Test',suppliedEmail='abctest@123.com',suppliedName='TestUser1');
            insert cse1;
            case cse2 = new case(subject='Test',suppliedEmail='abctest94@123.com',suppliedName='Test User2');
            insert cse2;
     }       
    

}