Hi @Abhilashpj,
The Enhanced Recurring Payments (ERP) package is only available in US, CA, UK, and AU. So for your Singapore account, in won't work. If you have previously or currently added the Pro product to your Sandbox or live PayPal account, unfortunately you will not be able to ever add ERP to that account. In this instance, it would require that you create a new Sandbox and/or live PayPal account and only add the ERP product (do not add Pro).
If you create a new US Sandbox account and continue to receive the message that you advised of above when attempting to add ERP, please file a support ticket directly at https://www.paypal-techsupport.com.
Thanks,
Carlos
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