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Error message

In a function call, you tried to pass an expression rather than a variable or property to a parameter that was declared as ByRef in the called method.

Examples

The following method takes one parameter that was declared as ByRef:

Sub Squarit(ByRef c as Double)
c=c*c

The calling function is:

Dim a,b as Double
a=5
b=10
Squarit(a*b) //cannot use an expression here

See Also

ByRef operator.