[Name] error.execution [Defined in] 3.12.2 Errors [See also] 4.6 , 5.4 , 5.8 , 5.10.1 Conditional Expressions, 5.10.2 Location Expressions, 5.10.3 Legal Data Values and Value Expressions, 5.10.4 Errors in Expressions, 5.11 System Variables, 6.2 , D.2.3 Location Expressions, D.2.5 , D.3.5 [Description] 
Indicates that an error internal to the execution of the document has occurred, such as one arising from expression evaluation.