Not working lately with Drupal 7

The following error happens with Drupal 7.12 and Webform 7.x-3.15 whenever I try to import the Webform exported data:
Since this is a coding error, I'm giving a bug report about it. Also the Instructions dropdown does not show anything.

Notice: in webform_import_form_submit() (line 284 of /Library/WebServer/Documents/path/sites/all/modules/webform_import/webform_import.module).
Warning: htmlspecialchars(): Invalid multibyte sequence in argument in check_plain() (line 1572 of /Library/WebServer/Documents/path/includes/bootstrap.inc).
Notice: Undefined index: S in webform_import_form_submit() (line 284 of /Library/WebServer/Documents/path/sites/all/modules/webform_import/webform_import.module).
Notice: Undefined index: T in webform_import_form_submit() (line 284 of /Library/WebServer/Documents/path/sites/all/modules/webform_import/webform_import.module).
Notice: Undefined index: D in webform_import_form_submit() (line 284 of /Library/WebServer/Documents/path/sites/all/modules/webform_import/webform_import.module).
Notice: Undefined index: I in webform_import_form_submit() (line 284 of /Library/WebServer/Documents/path/sites/all/modules/webform_import/webform_import.module).
Notice: Undefined index: U in webform_import_form_submit() (line 284 of /Library/WebServer/Documents/path/sites/all/modules/webform_import/webform_import.module).
Notice: Undefined index: U in webform_import_form_submit() (line 284 of /Library/WebServer/Documents/path/sites/all/modules/webform_import/webform_import.module).
Notice: Undefined index: P in webform_import_form_submit() (line 284 of /Library/WebServer/Documents/path/sites/all/modules/webform_import/webform_import.module).
Notice: Undefined index: H in webform_import_form_submit() (line 284 of /Library/WebServer/Documents/path/sites/all/modules/webform_import/webform_import.module).
Notice: Undefined index: D in webform_import_form_submit() (line 284 of /Library/WebServer/Documents/path/sites/all/modules/webform_import/webform_import.module).
Notice: Undefined index: P in webform_import_form_submit() (line 284 of /Library/WebServer/Documents/path/sites/all/modules/webform_import/webform_import.module).
Notice: Undefined index: T in webform_import_form_submit() (line 284 of /Library/WebServer/Documents/path/sites/all/modules/webform_import/webform_import.module).
Notice: Undefined index: P in webform_import_form_submit() (line 284 of /Library/WebServer/Documents/path/sites/all/modules/webform_import/webform_import.module).
Notice: Undefined index: I in webform_import_form_submit() (line 284 of /Library/WebServer/Documents/path/sites/all/modules/webform_import/webform_import.module).
Notice: Undefined index: T in webform_import_form_submit() (line 284 of /Library/WebServer/Documents/path/sites/all/modules/webform_import/webform_import.module).
Notice: Undefined index: I in webform_import_form_submit() (line 284 of /Library/WebServer/Documents/path/sites/all/modules/webform_import/webform_import.module).
Notice: Undefined index: W in webform_import_form_submit() (line 284 of /Library/WebServer/Documents/path/sites/all/modules/webform_import/webform_import.module).
Notice: Undefined index: W in webform_import_form_submit() (line 284 of /Library/WebServer/Documents/path/sites/all/modules/webform_import/webform_import.module).
Notice: Undefined index: D in webform_import_form_submit() (line 284 of /Library/WebServer/Documents/path/sites/all/modules/webform_import/webform_import.module).