Two things:
- The limit on the number of Spark.variables is currently ten, set here: https://github.com/spark/core-firmware/blob/master/inc/spark_utilities.h#L43 I just tested that I could create 5 variables without issue. I suspect your 5th variable is a string…
- There is a bug that we’ve got in our backlog with strings as Spark.variables—they do not currently work AFAIK. I just spent a little time looking over the code and saw no immediate problems. I’ve asked @satishgn to dig into it this week.