Intensity assumptions would be an input to a LEAP model. The demand would be an input: the result of combining your intensity and activity level assumptions.
Hi there - I have occasionally seen this message. It is usually due to a temporary lock having been put on the file by Windows. This can sometimes happen if the file is open in another program or perhaps in a 2nd instance of LEAP. It will typically be solved by closing down all instances of LEAP and then retrying, but it can also usually be safely ignored.