Object not found in object repository Even it exists There

[Rohit]

I am getting one error that

The "customer[mobile_number]" object was not found in the Object Repository.
Check the Object Repository to confirm that the object exists or to find the correct name for the object.


on following line OF Code

Code:

StrMobileNO = Browser("mySite").Page("mysite").WebEdit("customer[mobile_number]").GetTOProperty("Text")

i have make sure that in object repository The object "customer[mobile_number]" does exist.

Can any one tell me i mistake i m doing