I am working with ImageJ, trying a plugin for Angiogenesis analyzer. It is adapted to opening a batch of files to analyze at once, but when I try opening a folder with files, it gives me an error message “No .tiff files found”. My files are in .tiff format and wrapped in a folder. I wonder whether the problem is some specific metadata that is with images or how can I understand what is wrong by reading the code. Here is the original code for the plugin: https://imagej.net/ij/macros/toolsets/Angiogenesis%20Analyzer.txt

And here is the code specifically for batch handling:

    //  batch processing adapter:
    function batchProcessing () {
        selectedDir = getDirectory("Choose a Directory ");
        nameInitImageorFolder = File.getName(selectedDir);
        setBatchMode(true); 
        settings ();
        workingImagTemp="";
        windowTabName ="Stat Results Table";
        nameOfStatTab="["+windowTabName+"]";    // ajuster le nom avec le nom de dossier master
        if (isOpen(windowTabName)) {print(nameOfStatTab, "\Clear");}
        countBatch = 0; // number of file to analyse    
        countFiles(selectedDir);
        incremcountBatch = 0;   fileProcessed=""; countBatchTreated=0;
        starttime = getTime();
        if (countBatch > 0) {
            showMessageWithCancel (countBatch + " Image(s) will be processed");
            if (isOpen(batchStatusWindow)) {print(batchStatus, "\Clear");} 
            processFiles(selectedDir);
            fileProcessed=fileProcessed + "Nb image(s) processed="+countBatchTreated+ ". Processing time= "+ HMS (getTime-starttime) ;
            saveTab (selectedDir,windowTabName,nameInitImageorFolder);      
        } else {exit ("No .tiff file found");}
    }

I am pretty new to Java and although I understand most of syntax, I may be missing something.
I thought that the problem was this line:

countBatch = 0

But changing it did nothing.