API documentation says that there is not "getCellAddressString" method exposed by the topLeftCornerCell. You should instead pass a cell object to it as follows:
Please let me know if this solves the situation.
Thanks for the reply, but it does not solve the problem. It shows the below error
Cannot call method 'getHashCode' of null
Please help asap
I am currently investigating this error and will update once I have more information.
Okay. Please give some solution as soon as possible.
I have investigated your issue, and I have asked our engineering staff to examine this further. To ensure that it will receive attention, I have logged this behavior in our internal tracking system with a Development ID of 221812. The next step will be for a developer to review my investigation and confirm my findings or to offer a fix, or other resolution.
I will leave this case open and update you with any new information after the review. You can also continue to send updates to this case at any time.
You can view the status of the development issue connected to this case by selecting the "Development Issues" tab when viewing this case on the web site.
Please let me know if you need more information.