I am using the ublosy version 2.1.1.0 and I am trying to do a search using something like "test", but for some reason when I used this word "test" I am getting the following error

Error loading MacroEngine script (file: /uBlogsy/uBlogsyListPosts.cshtml)

Error Loading Razor Script (file: uBlogsy - List Posts) Object reference not set to an instance of an object.    at uBlogsy.BusinessLogic.PostService.<>c__DisplayClass19.<DoSearch>b__17(DynamicNode x) in D:\_PROJECTS\Personal\uBlogsy\Branches\2.1.1.0\uBlogsy\uBlogsy.BusinessLogic\PostService.cs:line 543
  at System.Linq.Enumerable.<>c__DisplayClassf`1.<CombinePredicates>b__e(TSource x)
  at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext()
  at System.Linq.Enumerable.<DistinctIterator>d__81`1.MoveNext()
  at System.Linq.Buffer`1..ctor(IEnumerable`1 source)
  at System.Linq.OrderedEnumerable`1.<GetEnumerator>d__0.MoveNext()
  at System.Linq.Enumerable.Count[TSource](IEnumerable`1 source)
  at uBlogsy.BusinessLogic.PostService.GetContentForPage(IEnumerable`1 nodes, Int32 pageNo, Int32 itemsPerPage) in D:\_PROJECTS\Personal\uBlogsy\Branches\2.1.1.0\uBlogsy\uBlogsy.BusinessLogic\PostService.cs:line 613
  at uBlogsy.BusinessLogic.PostService.GetPosts(Int32 nodeId, String tag, String category, String author, String searchTerm, String commenter, Int32 pageNo, Int32 itemsPerPage) in D:\_PROJECTS\Personal\uBlogsy\Branches\2.1.1.0\uBlogsy\uBlogsy.BusinessLogic\PostService.cs:line 223
  at ASP._Page_macroScripts_uBlogsy_uBlogsyListPosts_cshtml.Execute() in c:\Resources\Directory\68de6b5767fc43eaa069cceafd658f17.WebRole.Sites\spq.parachutewebsites.com\macroScripts\uBlogsy\uBlogsyListPosts.cshtml:line 45
  at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()
  at System.Web.WebPages.WebPage.ExecutePageHierarchy()
  at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)
  at umbraco.MacroEngines.RazorMacroEngine.ExecuteRazor(MacroModel macro, INode currentPage)
  at umbraco.MacroEngines.RazorMacroEngine.Execute(MacroModel macro, INode currentPage)




 

I am not sure because I don't have the src code, to see what is going on. 

What can I do to solve this issue?, I re-installed the package but does not work, I deleted and created a new document called test but it does not work. 

Thanks.