How to count cells with color that contain string in a range

I need to count the cells that have a color and contain a string within a range

When I add a 3rd param it says Range not found line 14 which is var range = activeSheet.getRange(rangeA1Notation);

Here is what I have tried so far but only get #value and says range not found.

/*** @param {range} countRange Range to be evaluated* @param {range} colorRef Cell with background color to be searched for in countRange* @param {range} comparisonRef cell with string to be searched for in colorRef* @return {number}* @customfunction*/function countColoredCells(countRange,colorRef,comparisonRef) {  var activeRange = SpreadsheetApp.getActiveRange();  var activeSheet = activeRange.getSheet();  var formula = activeRange.getFormula();  var rangeA1Notation = formula.match(/\((.*)\,/).pop();  var range = activeSheet.getRange(rangeA1Notation);  var bg = range.getBackgrounds();  var values = range.getValues();  var colorCellA1Notation = formula.match(/\,(.*)\)/).pop();  var colorCell = activeSheet.getRange(colorCellA1Notation);  var color = colorCell.getBackground();  var count = 0;  for(var i=0;i<bg.length;i++)    for(var j=0;j<bg[0].length;j++)      if( bg[i][j] == color && values[i][j].slice(0,2) == comparisonRefValue) //Count++ only if there is a color match and a model match        count=count+1;  return count;};

Function used as such:

=countColoredCells(C5:I16,J7,A3)

Updated code:
If I replace comparisonRefValue variable with "string" it works as expected as long as I only pass 2 variables the 3rd breaks the function.