General run error. Line (18): "Loop while Browser("Index:=0").Object.Busy"

[AshokReddy]

For the below code, i am getting General Run Error as
"General run error.
Line (18): "Loop while Browser("Index:=0").Object.Busy". "

Please help me out know why this error is being throwed when executed. what line of code is causing the problem here.

Code:

Set odesc = Description.Create
odesc("micclass").value = "Browser"
Set coll = Desktop.ChildObjects(odesc)

For i=coll.count-1 to 0 step-1
    Browser("CreationTime:="&i).close
Next

systemutil.Run "iexplore.exe","ww.gmail.com"

        Browser("Index:=0").Page("index:=0").Sync
        strt_time=timer
        'sttime=TIMEVALUE(hour(time) &":"& minute(time)+1 &":"&second(time) )  timer- strttime>60
        Do
            If ( timer- strt_time) >60 then                   ' TimeValue(sttime) Then
                Exit do
            End If
        Loop  while Browser("Index:=0").Object.Busy