Activity › Forums › Salesforce® Discussions › What is error code 30000 from REST API in Salesforce? Tagged: Callout Method, Error Code 3000, Rest API Salesforce® Discussions What is error code 30000 from REST API in Salesforce? Posted by Yogesh on September 20, 2019 at 10:33 AM I am getting this error while executing a callout method in class . Laveena replied 6 years, 7 months ago 2 Members · 1 Reply Callout MethodError Code 3000Rest API 1 Reply Laveena Member September 20, 2019 at 12:40 PM Hi Yogesh, To remove this error, just add maximum length of a field in Data Extension. Thanks Log In to reply. Public All Members My Connections Only Me PublicAll MembersMy ConnectionsOnly Me Public All Members My Connections Only Me