It looks like you're new here. If you want to get involved, click one of these buttons!
greyelf wrote: »
There are two different Twine applications (1 and 2) and a game made with one cannot be imported into the other. Most of the older games were made using Twine 1.
A quick way to check is to either:
a. Read the Twine version information in the HTML source code
b. Try to import the HTML into the on-line version of Twine 2 and if it fails with that message then it is likely that the HTML file was built using Twine 1 and you will need to use it's Import > Compiled HTML file option.