Look in your logs while you open the Dashboard, it will complain about specific pistons. Try to then address those pistons individually.
Are you referring to the Dashboard? If so, did you push the Reset Security Token? If not, DONâT do it! I ended up having to reinstall due to a deficiency with ST handling of tokens.
âI get this error over and over
8â:â24â:â05â âPM: error java.lang.NullPointerException: Cannot get property âlâ on null object @ line 2605
I looked under my location â> Installed SmartAppsâCore
I see my pistons I created there. I also see one labeled CoRE that I didnât create and it says created yesterday afternoon around 5pm during the issues Smartthings was having. There is nothing inside it itâs blank. I assume this is my problem. I donât remember seeing it there before. How do I go about deleting it? Since it doesnât show up in my mobile app?
Or is this supposed to be there and I just donât remember? Which is a strong possibility since I do not go into this part of the IDE very often,
I say delete the empty Core item VERY carefully.
- Be sure it wasnât a piston you liked, that is just empty now. Iâd try going into the Smartapp and try editing the empty one. In fact you could skip my instructions below if you are able to remove it here at this step by âremoveâ at the bottom. Remember though not to remove the parent Core app, only child pistons.
- When following my crude instructions (there are better if you search the community), make sure you are only trying to delete an child, not a parent app. You can tell by the structure. If nervous, create a dummy piston with a silly name, and then uninstall it first.
Instructions:
- Go to IDE
- Click My Locations
- Click âList Smartappsâ at bottom.
- Click âeditâ at the top.
- Scroll down till you see your favorite piston, donât touch.
- Look for the empty one, be sure itâs not the parent or your favorites, uninstall it.
In the below, I would not touch âCoREâ, but I would be fine uninstalling Home Theater button 5 as I donât use it yet. 
If this all makes you nervous, call support. I believe theyâd help you delete a child app.
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Done! Thank you very much. I looked right past the big EDIT at the top.
Much appreciated.
Again I learn even more from the very knowledgeable people on this Forum!!!
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Nervous??? What am I going to do BREAK IT???
Sorry I just saw that part after I posted. Whatâs the worse that could happen? Start all over?
Yeah, some people have complicated pistons, and would go crazy if they lost them. Iâve never lost one, but if I did, it would be an opportunity to make it better. Did that with my hub move v1 to v2, was best thing I did.
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With Smart Rules, I can make a Quick Tap rule.
A Quick Tap is how you get the icon on the widget section on the iPhone.
Is there a way to execute rules in CoRe with widgets?
I have never played with ST widgets before. Thinking about it, if you can link a routine widget to a CoRE DO piston, then my answer would be yes 
@ady624 is this possible?
Whatâs different about a DO piston that I canât change an existing one to it? I have a few that are basically just DOâs but I canât make it âofficial.â
I was curious when I posted that earlier. I was able to create a Piston that subscribes to Routine execution, I was able to add whatever tasks I wanted or execute a DO piston.
DO pistons do not have an IF. So if you added any condition, buh-bye DO.
You canât get a DO piston to execute when a routine is run, DO pistons can only be executed by other pistons. Why DO and not Basic? IF Routine X executed, THEN do thisâŚ
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I can add widgets and display them in the dashboard - then you can use them as triggers for pistons - thatâs a very good idea, actuallyâŚ
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Can someone tell me how to make a âDOâ piston real quick - I donât see it anywhere.
When you start a new piston itâs the top option.
On Android, Iâd do this using Tasker and the CORE IFTTT trigger-by-URL feature. Either that, or via sharptools and a virtual switch.
My pistons had been running pretty reliably so I havenât been paying attention. But I did notice today that my living room lights donât seem like the temperature had been changing lately. I have a time based piston to adjust the temperature throughout the day. Opened the piston and it was empty⌠nothing there. Never happened before!
I scrolled down and hit rebuild, and wham! It was back in all of its glory, barely any effort on my end.
So yeah, thatâs really cool! Thanks @ady624 !!
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When trying to access the dashboard I only get invalid token. Any ideas? Was working before
Update: Found the âreset security tokenâ in the settings, this fixed it
v0.2.148.20160902 - Beta M2 - Added instructions for removing dashboard taps. Thank you @dseg for the Tap idea.