This is the developers writers-block, it happens and could last for days to weeks (personally, for several months) and is triggered when the mind is not being inspired, usually by boring periods of mundane tasks and/or life events -- kills the creative spark, energy levels drop, the mind goes into dormancy.
You have to find something inspiring, a problem, the mind likes to solve puzzles, to kick-out of writers block. Take a break, go outdoors.
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