Something like this will produce the same error as you had.

V=(-2)^.5

This is what Gary's Student has already mentioned.

Keiji

Philosophaie wrote:
Dim V, E ,m,r as double

'error line
V=(2*(E - m/r))^.5
'all the variables have values to them

When I run it I get:

Run-time error '5':
Invalid procedure call or argument.

What may be the error?