Not a media player expert, but I would guess from the code you have given,
lastpos = 0. Therefore you are trying to set CurrentPosition = -5, which, as
the error message states, is invalid.
So you have to set the value of lastpos somewhere and check its value

lastpos=MP.<SomeProperty
'code....
Const REWIND_SECONDS as long=5
if lastposREWIND_SECONDS then
MP.CurrentPosition = lastpos - REWIND_SECONDS
else
MP.CurrentPosition = 0
end if

Not sure what a CurrentPosition = -1 means, but check the docs.

NickHK

"teepee" wrote in message
...
I want to get media player to jump back 5 seconds with a VBA macro

I tried

Dim lastpos As Long
MP.CurrentPosition = lastpos - 5

but that didn't work. It just says:

run time error 380

currentposition must be -1.0 or greater than or equal to 0.0

Anyone know how it might be done?