In the version 1.14 we used placeholder callables in the default configuration of the scheduler. In the version 1.16 per default no placeholder callables are created. You only get placeholder callables if a configured app is not installed, e.g. if the motion app is uninstalled. The mentioned error is set if a placeholder callable is in the configuration after booting. The scheduler waits until the all required callables are available and then gets an timeout. To avoid the error you have to delete the placholder callables in the scheduler.
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