How do i Resolve error Unknown Error could not load type system.valueTuples2 from assembly

[Mark N Okafor]

i am getting the Following error when i try connecting my VisualStudio 2017 Community Edition to My BitBucket Account: Unknown Error (could not load type 'system.valueTuples'2' from assembly 'System.ValueTuple, version=4.0.3.0,Culture=neutral,PublicKeyToken=cc7b13ffcd2ddd51'.). check logs for more info

this is my first time using any Ripo and i just Created my Bit Bucket Account Today. installed the Bit Bucket extension from within visualStudio 2017and the installation completed sucessfully. please help me