problem with deployment

hii..       i have a reporting system working on my localdomain perfectly with all datbase integration ....but when i deploy it to the server with ftp its gets deployed perfectly but its not running over there and prompting..    Application Error    Rails Failed to Start Properly...

plz suggest me what could be the possible problem with it..even on index.html page its not able to get appliaction enviornment..plz suggest remedy or possible problem...