It is having problems reading a configuration file called 'mbhd.yaml' in your application directory.

It is stored in somewhere like:
C:\Users\example\AppData\Roaming\MultiBitHD

'example' is your user name.

You can try the following:
+ Shut down MultiBit HD
+ rename mbhd.yaml to old-mbhd.yaml
+ start up MultiBit HD

It will then recreate the file with the default settings.

Bug raised as: https://github.com/bitcoin-solutions/multibit-hd/issues/653