The Roku Vudu Error Code 28 occurs in the Vudu service when there is a block in the network connection. It can also happen due to misconfigured system files that can cause registry issues in your operating system. The registry error occurs when new apps are launched without uninstalling the old ones properly. It can cause system crashes, slow performance, program lock-ups, and more on your personal computer. The errors can also arise from unwanted software such as spyware, adware, viruses, and malware.