System.LimitException: Too many DML statements: 1

Exception:

If you use below code it will throw an error System.LimitException: Too many DML statements: 1 ,it is because you have an dml statement in your aura-method which is enabled for cache.

public with sharing class GetAllAccountsCntrl {
   @AuraEnabled(cacheable=true)
    public static List<Account> processAllAccounts() 
 {
        List<Account> lstAcc = new List<Account>();
  for(Account acc:[SELECT Id, Name,AccountSource,Website, Createddate FROM Account Limit 10])
  {
      acc.Name = 'LWC Testing...';
   lstAcc.add(acc);
  }
  Database.update(lstAcc,false);
  return lstAcc;
    }

}

Workaround:

Please remove (cacheable=true) from your method declared above,then this will work without any error

public with sharing class GetAllAccountsCntrl {
   @AuraEnabled
    public static List<Account> processAllAccounts() 
 {
        List<Account> lstAcc = new List<Account>();
  for(Account acc:[SELECT Id, Name,AccountSource,Website, Createddate FROM Account Limit 10])
  {
      acc.Name = 'LWC Testing...';
   lstAcc.add(acc);
  }
  Database.update(lstAcc,false);
  return lstAcc;
    }

}

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