the use of oprofile

[³Â¼Î <ch...@bi...>]

Dear sir:
     When I use the command "opannotate --source ./name" to get the result after
using the command "opcontrol --dump".There will have an error that "opannotate
error: No sample file found: try running opcontrol --dump or specify a session
containing sample files".
     what is the reason of the error? How can I do to get the result? 
     Best regard!