error: Unknown module(s) in QT: thread

[gaganbm]

Recently I updated to Qt 5 and the version of Qt Creator I am using is 2.6.84

Before the update, my project was working well. But, now without even any change done to any of the codes, the build is failing with the error :

error: Unknown module(s) in QT: thread

Any hints how to fix this?

Thank you.