Calling next_items_page function from C# graph API

[knpashish (Ashish Tiwari)]

Hi Team we are calling next_items_page via graph C# as per below :
string cursorId = “"skfkdsfkdskf kdjadwkdlwklkewleklwqweql"”;
string query1 = “{ "query": "” + @"{ next_items_page(cursor: " + cursorId + ") { cursor items { id name column_values { column { title } text value } } } } " + “" }”;

String is created in as below format :

Query1={ “query”: "{ next_items_page(cursor: “MSw0MDQ5MDUwMjY2LEZqRThpaU9neE5iWWpJbV9MXzlDOSw0OTI3LDI1LHwxNzU1NTU0NDQ1”) { cursor items { id name column_values { column { title } text value } } } } " }
but its giveen erroe ID=9 and status=runtocompletion Reason phrase: InternalServer error Please help me why its giving error