preprocess-page.inc

* Notice: Undefined index: menu_data in include() (line 178 of D:\xampp\htdocs\4-explorer\sites\all\themes\omega\omega\preprocess\preprocess-page.inc).
* Notice: Undefined index: menu_data in include() (line 178 of D:\xampp\htdocs\4-explorer\sites\all\themes\omega\omega\preprocess\preprocess-page.inc).
* Notice: Undefined index: menu_data in include() (line 178 of D:\xampp\htdocs\4-explorer\sites\all\themes\omega\omega\preprocess\preprocess-page.inc).
* Notice: Undefined index: menu_data in include() (line 178 of D:\xampp\htdocs\4-explorer\sites\all\themes\omega\omega\preprocess\preprocess-page.inc).
* Notice: Undefined index: menu_data in include() (line 178 of D:\xampp\htdocs\4-explorer\sites\all\themes\omega\omega\preprocess\preprocess-page.inc).
* Notice: Undefined index: menu_data in include() (line 178 of D:\xampp\htdocs\4-explorer\sites\all\themes\omega\omega\preprocess\preprocess-page.inc).
* Notice: Undefined index: menu_data in include() (line 178 of D:\xampp\htdocs\4-explorer\sites\all\themes\omega\omega\preprocess\preprocess-page.inc).
* Notice: Undefined index: menu_data in include() (line 178 of D:\xampp\htdocs\4-explorer\sites\all\themes\omega\omega\preprocess\preprocess-page.inc).

This is the error message I receive an a brand new installation - no content created so far. Can somebody help me with this?

Thanks,
Kirsten