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...