upgrading Moodle 1.9.12+ to 2.0.3 ends up with error on scorm conversion (Invalid file path)

I've got a problem with upgrading Moodle 1.9.12+ to Moodle 2.0.3.

During the upgrade process, I got the following exception when processing scorms:

-->mod_scorm
Default exception handler: Unknown exception related to local files (Invalid file path) Debug:

• line 781 of /lib/filestorage/file_storage.php: file_exception thrown
• line 93 of /mod/scorm/db/upgradelib.php: call to file_storage->create_file_from_pathname()
• line 105 of /mod/scorm/db/upgradelib.php: call to scorm_migrate_moddata_subdir()
• line 105 of /mod/scorm/db/upgradelib.php: call to scorm_migrate_moddata_subdir()
• line 105 of /mod/scorm/db/upgradelib.php: call to scorm_migrate_moddata_subdir()
• line 44 of /mod/scorm/db/upgradelib.php: call to scorm_migrate_moddata_subdir()
• line 177 of /mod/scorm/db/upgrade.php: call to scorm_migrate_moddata_files()
• line 526 of /lib/upgradelib.php: call to xmldb_scorm_upgrade()
• line 265 of /lib/upgradelib.php: call to upgrade_plugins_modules()
• line 1425 of /lib/upgradelib.php: call to upgrade_plugins()
• line 146 of /admin/cli/upgrade.php: call to upgrade_noncore()

!!! Unknown exception related to local files (Invalid file path) !!!
!! Stack trace: * line 781 of /lib/filestorage/file_storage.php: file_exception thrown

• line 93 of /mod/scorm/db/upgradelib.php: call to file_storage->create_file_from_pathname()
• line 105 of /mod/scorm/db/upgradelib.php: call to scorm_migrate_moddata_subdir()
• line 105 of /mod/scorm/db/upgradelib.php: call to scorm_migrate_moddata_subdir()
• line 105 of /mod/scorm/db/upgradelib.php: call to scorm_migrate_moddata_subdir()
• line 44 of /mod/scorm/db/upgradelib.php: call to scorm_migrate_moddata_subdir()
• line 177 of /mod/scorm/db/upgrade.php: call to scorm_migrate_moddata_files()
• line 526 of /lib/upgradelib.php: call to xmldb_scorm_upgrade()
• line 265 of /lib/upgradelib.php: call to upgrade_plugins_modules()
• line 1425 of /lib/upgradelib.php: call to upgrade_plugins()
• line 146 of /admin/cli/upgrade.php: call to upgrade_noncore()
  !!