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When launching gazebo no GUI overlay apears, and 'undefined symbol' error is printed in terminal

Hi. I followed GUI overlay tutorial "Display Simulation Time". When launching Gazebo no GUI overlay appears, and following error is printed in the terminal:

[Err] [Plugin.hh:180] Failed to load plugin /.../ undefined symbol: _ZN5QTest18lastMouseTimestampE [Err] [] Unable to create gui overlay plugin with filename[]

The other tutorial "Spawn spheres" results in similar error

I am using Gazebo 9.0.0 Ubuntu 18.04 LTS Qt version 5.9.5