**1) Give a description of the problem
Simple timed piston, every 30 seconds, not working
2) What is the expected behavior?
It works!
3) What is happening/not happening?
After saving I get this: An error has occurred while subscribing: java.lang.NullPointerException
4) Post a Green Snapshot of the piston
5) Attach any logs (From ST IDE and by turning logging level to Full)
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11/26/2018, 6:27:03 PM +918ms
+1ms ╔Starting piston… (v0.3.108.20180906)
+153ms ║╔Subscribing to devices…
+201ms ║╚Finished subscribing (57ms)
+241ms ║An error has occurred while subscribing: java.lang.NullPointerException
+243ms ╚Piston successfully started (242ms)
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