Fatal G2 error

Here's the error from G2: Error (ERROR_PERMISSION_DENIED) : Invalid return URL! The requested URL https://www.the-huberts.net/gallery?g2_view=search.SearchScan&g2_form%5BuseDefaultSettings%5D=1&g2_return=%2Fgallery%3Fg2_view%3Dmap.ShowMap%26g2_Mode%3DNormal%26g2_Group%3D%26g2_album%3DIMAG1108%250A%250D%250ABaumstamm%2Bdurchs%25C3%25A4gen%250A%250D%250A%2528divx4%2B%252F%2B5%252C4%2BMB%2529%250D%250A%250D%250A%26g2_wpg2_returnurl%3Dhttps%253A%252F%252Fwww.the-huberts.net%26g2_wpg2_returnname%3Dwww.the-huberts.net contains malicious characters.