The Twine 2 application does not currently support Twine 1's TWS file format.
If you need to share your Twine 2 project with people using the Twine 1 application then the Converting a Twine 2.x story HTML file into a Twine 1.x TWS file: option in this thread may help.
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If you need to share your Twine 2 project with people using the Twine 1 application then the Converting a Twine 2.x story HTML file into a Twine 1.x TWS file: option in this thread may help.