Crashing of the launcher

[Android Question]

IN lava Iris 355, a gingerbread supporting android phone. I installed magic locker main but after some time I reinstalled it but after reinstalling it the mango launcher which was it default launcher crashed and now whenever I press back key a message comes "launcher crashed due to process com.hquain.com" "FORCE CLOSE" since I deleted everything regarding magic locker even from the data. Then why does it come

 

[Unforgiven]

This type of launcher error can normally be cleared up by clearing the data and cache. Go to settings | apps | all | mango launcher (name may vary a bit, but I'm going with what you posted) and the buttons to delete data and cache are there.