Redstone clocks and pistons

Joined
Nov 20, 2018
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#1
i got a message that the number maximum of pistons will be 300 but you can't use them

Im new to mana cube but i have made redstone clocks with pistons por several things like sugarcane farming but after 4 or five tics they stop working and you can see only the smoke coming from the pistons. What is the problem with them?