Yup we need much more info
What phone do you have? Nokia 7610?
Which theme are you onabout? Provide a link please
When does it say operation failed? What exactly are you doing?
Is the error message on the phone or the PC?
How did you transfer the theme from internet to pc to phone? Or using WAP?
If from PC to phone, what was the file extention on the file e.g. *.zip, *.sis?
Which folder did you put the theme in if any?
Thanks and welcome to mobile 9