Since paypal has convinced all the websites using it to limit the revenues of the domain investor, stealing or diverting the revenues, the domain investor decided to use other websites.
Inboxcash is a paid to read email website, and the domain investor decided to review the website, since it has a low minimum payout
Yet after the minimum payout was reached, when the domain investor tried to withdraw for payment proof, it is giving a balance error which could be a software problem.
On forums, others have posted a payment proof for minimum payout , so it appears that the website is hacked.
This shows how ruthless the indian internet companies are in reducing the income to zero.