realpath - Unable to access in ncludes/file.inc - line 182.

At some servers there is such errors.

The reason seems to be that the function filefield_paths_file_move pass to file_create_path the content of the variable $dirs, which is supposed to be a subdirectory of the files directory. Function file_create_path tries first to check whether the path is contained either within the files directory or within the temporary directory, only at the end it tries to prefix the path with the files directory location.

The path passed to file_create_path should be prefixed with the files directory location to avoid unnecessary lookups and warnings:

function filefield_paths_file_move(&$file, $replace = FILE_EXISTS_RENAME) {
  $dest = _filefield_paths_strip_path(dirname($file['filepath']['new']));

  foreach (explode('/', $dest) as $dir) {
    $dirs[] = $dir;
    $path = file_create_path(file_directory_path() .'/'. implode($dirs, '/'));