Too many DML statements: 1 out of 0 Error in Salesforce

Too many DML statements: 1 out of 0 Error in Salesforce

Check the below options to fix the “System.LimitException: Too many DML statements: 1” exception in Salesforce.
 
1. Visualforce Page:
In <apex:page> tag, if attribute “readonly” is true and if we
try to execute DML statements(Insert, Update, Delete), then it shows Too
many DML statements: 1 out of 0 Error in Salesforce.

So, in order to rectify this error, set readOnly = “false” or remove this attribute in <apex:page> tag.

Sample code:

<apex:page controller=”Sample” sidebar=”false” readOnly=”false”>

When you set readOnly attribute of page to true then it does not allow any DML statements.

 
2. Aura Component:
Do not use @AuraEnabled(cacheable=true). Use @AuraEnabled. Remove (cacheable=true).
 
3. Lightning Web Component: 
a. Do not use @AuraEnabled(cacheable=true). Use @AuraEnabled. Remove (cacheable=true).
b. use async await while calling method that does DML Operations. 

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