The internal Salesforce error that results in a GACK notification. The corresponding Error ID's can be used by Salesforce to diagnose the issue.

See Salesforce Developers Blog - What Is A Gack?

There are two components in a GACK Error ID:

E.g. 1930371979-47278 (1185375568)

  1. The first part containing the hyphen is the identifier for the specific event.
  2. The number in the parentheses identifies the general stack track that produced that failure.