Hello @Vidya_Lingappa
There are many reasons this issue might occur…
First thing are you using licensed Microsoft Office ?
The below text was taken from website might include your cause
- Antivirus plug-in for Microsoft Office.
- Unplug from the network and deactivate the plugin.
- Unregistered or unactivated Excel.
- Run Excel to register and activate it with the Windows Registry .
- “Automation Server Busy” if there is a dialog open in Excel or a calculation is in progress.
- Try again later
These are few link where user faced the same issue check the below links
Message: Call was rejected by callee
Excel scope Exception - #5 by CamiCat
Message: Call was rejected by callee - #8 by ltenu
Excel application scope : Exception from HRESULT: 0x800AC472 - #5 by aksh1yadav
Weird error ( will be challenge) - #5 by loginerror
- Try again later
Check this link too