If the error does not show up in your uploaded file, than I don't know how we can tell you why you are getting the error. Your screenshot/pictures suggest that the error is showing up in a chart. Your uploaded sheet has a lot of tabs and picture objects and such, so perhaps I just overlooked it, but I did not find any charts in your uploaded sheet.

The usual scenario that I run into that creates this kind of error is when I execute a delete rows/columns/cells command (note the important distinction here between the delete and clear commands). If I delete the range being used by a chart data series, then I will get this kind of error.

Solutions:
1) If the delete command is still in the undo stack, undo until the problem is fixed.
2) Go into the select source data for that chart and point the broken references to the correct references.

To prevent this error, I pay careful attention to what the delete command does, and make sure to use the clear command instead of the delete command when I anticipate that the delete command will lead to broken references like this.

If this error is being raised in response to a different scenario, describe what you are doing before the error is raised.