Turbine game Launcher error. File not found exception.

My Turbine game Launcher got an error message.
I tried uninstalling this and reinstalling it back which caused so much time and still launcher meets an error.
Is there a fix to this problem?

Launcher Error
An error has occurred
Please contact Technical Support with the following information:
System.IO.FileNotFound: File or assembly name 89uk8tii.dll, or one of its dependencies, was not found.
File name: “89uk8tii.dll”
