triggers - TypeError: Cannot read property "source" from undefined. (line 339, file "Code") -


please can me fix following error.

typeerror: cannot read property "source" undefined. (line 339, file "code")

function myfunction(e) {   var getsheet = e.source.getsheetname();   var getrange = e.range.getcolumn();       if(getsheet == "wesham excess" && getrange == 3 || getsheet == "wesham  stock req"){          var stockemail = "excessstock@greenlifepharma.co.uk";         var stockreqemail = "wholesale@greenlifepharma.co.uk";           mailapp.sendemail(             (getsheet == "wesham excess") ? stockemail : stockreqemail ,             "excess stock - branch has added stock ",             "please see changes on main list of spreadsheet");   } } 

thanks in advance!


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