Mike,
The error means TestComplete was unable to find the object you specified. Perhaps, the tested application is not running, or the tested form is not shown on the screen, or the form does not contain the expected grid control (the control with the expected recognition properties).
Before running the test, please ensure that the tested application is in the same state as that it was in when you recorded (or created) the test. Please check whether the tested grid control is on the form and it has the same recognition attributes as those used when creating your test (maybe the control name was changed).
The following topic of TestComplete's documentation may help: Handling the 'Unable to Find the Object' Error.
