The "Invalid version" warning messages on the Toolbox server (Fig. 1) are not errors. They indicate that there are created custom Toolbox profilers without specified version.
Fig. 1
As these messages are just an indication, the work with the Toolbox system will be not affected.
Still, if you want to remove these warnings, you can open the profiler, go to the "Scheme" tab (Fig.2) and specify a version e.g. "1.0". Then save the scheme.
Fig.2
After restart of Toolbox, the warnings should not appear.