an unnamed object cannot be converted to a string" error

[burabura]

hi
I'm using eviews 8
I have an undated wfile
I have
a vector, say V
and
a series, say S
I want to put in any n-th position of the vector the value contained in a m-th position of the series
for instance
V(3) = @elem(S,7) works fine in a dated wfile but in the undated one I get a
"an unnamed object cannot be converted to a string" error.

why this error?
If I write
show @elem(S,7) I get a window with the correct value.
what can I do ?

thank you in advance

[EViews Gareth]

@elem(s, "7")

[burabura]

thank you
it works
....so easy