Edit include/FileUploaderFactory_12.6.js and replace:
with:
You probably need to clear your browser's cache after the edit.
JavaScript:
document.getElementById("progress-bar").style.display = "block";
document.getElementById("uploader_result").style.display = "block";
with:
JavaScript:
var progressBar = document.getElementById("progress-bar");
if (progressBar) {
progressBar.style.display = "block";
}
var uploader_result = document.getElementById("uploader_result");
if (uploader_result) {
uploader_result.style.display = "block";
}
You probably need to clear your browser's cache after the edit.