cache.html not found

let say we compiled gwt version1 and, user in the midst of using the
application. Then, we deployed a next version of gwt same app. User
resume to use it. User will be prompt that session already expired as
server restarted.When user continue to surf the app as ver1 still
exist in user browser, server side will throw

[WARN] No file found for: /myapp/
BB7188AEFBB31D2D5D0A51FDC55ACF51.cache.html
[WARN] No file found for: /myapp/
BB7188AEFBB31D2D5D0A51FDC55ACF51.cache.html
[WARN] No file found for: /myapp/
BB7188AEFBB31D2D5D0A51FDC55ACF51.cache.html

is this my assumption of the warning caused by scenario i descripted?
if yes, how to prevent this from happening?

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