Cannot save Calc spreadsheets

Libre office Calc
Ubuntu 15.10.
Created spread sheet by opening text file and then graphing the data. But every option for saving the file results in an error message: “Error saving the document result:
Wrong parameter.
The operation was started under an invalid parameter.”

I found the following link which could be useful…How can I save a spreadsheet with a chart on it?

Make certain that you have NOT selected the chart before saving the file…Peter