Line 1182:

				// If this is a 'too large' error, we won't
				if( err.code == -600 || err.code == -601 ){
					errorCounts[ ( err.code == -600 ) ? 'size' : 'ext' ]++;
					return;
				}

Uncaught ReferenceError: errorCounts is not defined
    at plupload.Uploader.error (ips.ui.uploader.js?v=0377a8ff2e1646391066:1184:6)
    at plupload.Uploader.dispatchEvent (plupload.dev.js?v=0377a8ff2e1646391066:2205:21)
    at plupload.Uploader.trigger (moxie.js?v=0377a8ff2e1646391066:2240:30)
    at plupload.Uploader.<anonymous> (plupload.dev.js?v=0377a8ff2e1646391066:764:8)
    at Array.<anonymous> (plupload.dev.js?v=0377a8ff2e1646391066:2036:26)
    at callNext (moxie.js?v=0377a8ff2e1646391066:374:13)
    at moxie.js?v=0377a8ff2e1646391066:376:31
    at plupload.dev.js?v=0377a8ff2e1646391066:2037:9
    at plupload.Uploader.<anonymous> (plupload.dev.js?v=0377a8ff2e1646391066:759:2)
    at Array.<anonymous> (plupload.dev.js?v=0377a8ff2e1646391066:2036:26)

Thank you, I have filed a bug report so we can review this. Typically it would mean that the file you're uploading is too large or empty.

@Stuart Silvester, I know what the error means. It is about a variable errorCounts. It is not defined anywhere, that's why the Uncaught referenceError.

I was giving context for anyone else reading this topic about why it was happening.

This has been resolved in the recently released 4.7..1 version of the platform. Please upgrade to that version if you are experiencing this issue, and if you still have any problems, please let us know.