Password Protect generating Issues

Everytime I activate Password Protect on my wordpress installation I get the following

Deprecated: Assigning the return value of new by reference is deprecated in /nfs/c09/h02/mnt/131745/domains/ on line 210

Furthermore, even when I install it I get the following error:
The plugin generated 247 characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.