copyparty failed to add the following files to the archive:

 file: '2D/4dstereocircles.png'
error: [OSError] [Errno 5] Input/output error
-- util.py:3082 <yieldfile>: buf = f.read(readsz)
-- szip.py:251 <ser>: for buf in yieldfile(src, self.args.iobuf):
-- szip.py:289 <gen>: for x in self.ser(f):

 file: '2D/4dstereosphere.png'
error: [OSError] [Errno 5] Input/output error
-- util.py:3082 <yieldfile>: buf = f.read(readsz)
-- szip.py:251 <ser>: for buf in yieldfile(src, self.args.iobuf):
-- szip.py:289 <gen>: for x in self.ser(f):
