Error

This keyword/value can only be used in conjunction with the Variant data type.
This keyword/value can be used to store an error number.
Normal error handling does not occur giving you the chance to take alternative action in code
Error values can be created by converting real numbers to error values using the CVErr() function
Error values are automatically generated by VBA when an error occurs.

Dim vMyVariant As Variant 
vMyVariant = Error 
vMyVariant = Error(9) 

CVError

CVERR - Returns a specific type of error.

IsError Function

ISERROR - Returns the value True or False depending if the expression is an error.

varType.vbError

There is a built-in constant that can be used to help identify errors.

Dim myError As Variant 
myError = CVErr(6) 
If (VarType(myError) = VBA.vbVarType.vbError) Then 
   Debug.Print "Error" 
End If