Modify from FileStream to Response not possible?

[CaptnBlubber]

I am trying to add Content to an existing file and output the result as Response.

I keep getting TypeError: Unable to modify PDF file, make sure that output file target is available and that it is not protected as an Error.

Here is the code that I am working with:

        response.setHeader("Content-Type", "application/pdf");

        var pdfWriter = hummus.createWriterToModify(new hummus.PDFRStreamForFile(path.join(__dirname, 'assets/input.pdf')), new hummus.PDFStreamForResponse(response));

        var pageModifier = new hummus.PDFPageModifier(pdfWriter, 0);

        var cxt = pageModifier.startContext().getContext();

        var pathFillOptions = {color:0xFF000000, colorspace:'cmyk', type:'fill'};
        var pathStrokeOptions = {color:0xFF00FF, width:4};

        // drawPath
        cxt.drawPath(75,640,149,800,225,640,pathFillOptions)
            .drawPath(75,540,110,440,149,540,188,440,223,540,pathStrokeOptions);

        // drawSquare
        cxt.drawSquare(375,640,120,pathFillOptions)
            .drawSquare(375,440,120,pathStrokeOptions);

        // drawRectangle
        cxt.drawRectangle(375,220,50,160,pathFillOptions)
            .drawRectangle(375,10,50,160,pathStrokeOptions);

        // drawCircle
        cxt.drawCircle(149,300,80,pathFillOptions)
            .drawCircle(149,90,80,pathStrokeOptions);

        pageModifier.endContext().writePage();
        pdfWriter.end();

        response.send();

As for environment, I am using Firebase cloud functions. The code for writing the response works if creating a new PDF from scratch.

[CaptnBlubber]

Nevermind I got it fixed. Seems like firebase wasn't updating my function properly. I changed my functions name redeployed and it worked.