No existing sandbox found. Preparing sandbox to start on game activity.

I am making my first dive into API's, but upon adding it and running the game, I found it wasn't working, so I looked at the mod Output console and found it said No existing sandbox found.  Preparing sandbox to start on game activity. I tried the restart API sandbox button, and tried everything I can find or think of myself, tried making a new game, completely restarting my browser, tried logging out and back in, and tried using a different browser, nothing seems to work, Is there anyone that can help me. before you ask, I did open the game in a separate tab for each of these steps.

Have you started up the campaign and entered it? The API doesnt load unless the campaign is open and running.

The sandbox was crashing a LOT more than usual today.

I always have the Mods console open in one tab while I launch the game in another tab. It makes troubleshooting much easier. 

Same. Our game sessions  usually run about 4 1/2-5 hours, and it's usual for the sandbox to crash at least twice each hour. Andrew R. said: I always have the Mods console open in one tab while I launch the game in another tab. It makes troubleshooting much easier. 

Rick A. said: Same. Our game sessions  usually run about 4 1/2-5 hours, and it's usual for the sandbox to crash at least twice each hour. That's pretty extreme. It should't be crashing that often. You might want to seek help to figure out why that's happening.

I submitted a help request about it and Roll20 support suggested I ask about it in the Mods (API Scripts) Forum. I haven't gotten around to that yet; i'm waiting for most of the bugs to get worked out of the new UI features in case the problem goes away once those are dealt with. The constant crashing started about two months ago. Before that it would only happen about once or twice per game session. GiGs said: That's pretty extreme. It should't be crashing that often. You might want to seek help to figure out why that's happening.

GiGs said: Rick A. said: Same. Our game sessions  usually run about 4 1/2-5 hours, and it's usual for the sandbox to crash at least twice each hour. That's pretty extreme. It should't be crashing that often. You might want to seek help to figure out why that's happening. It has been happening a lot to me lately as well.  Trying to troubleshoot it from my end first to see if something is interfering either from the software side or a conflicting mod in the games.  So far no luck. Also having issues with the sandbox not coming up when I enter the games. This happens about once out of every three or four times I start up a game.  GMing five games and prepping two more, so they get started a lot during a typical week. If I run out of options from my end, I will submit a help request.