Unable to update and install package in Studio

I am unable to update , install packages from manage package. When I am trying to do that, getting a pop up saying “Unable to resolve dependency Uipath.Version>=1.1.0”.

Also when I am opening the workflow for the first time it is showing some error message as well -

Could not find type ‘BuildDictionary(String,String)’ in namespace ‘http://schemas.microsoft.com/workflow/2012/07/xaml/activities’. Row: 220, Column: 32

Could not find type ‘AddToDictionary(String,String)’ in namespace ‘http://schemas.microsoft.com/workflow/2012/07/xaml/activities’. Row: 238, Column: 318

Could not find member ‘Value’ in type ‘http://schemas.microsoft.com/workflow/2012/07/xaml/activities:AddToDictionary’. Row: 239, Column: 44

I have just installed uipath into my system. Version : 2018.2.4 enterprise edition.

Any suggestion?