This error message may pop up in MultiCharts after you've applied a study to your chart. Floating point error means that there is a division by a variable in the code and this variable's value is zero. You need to identify this variable and fix it or to make sure that the variables value is not zero in the code.
To do this please use [[Print]] keyword to check value of the variables used it in the script.
Alternatively, you can deduce it using the following piece of code