我正在将connect-mongostore与krakenJS一起使用。一旦我运行代码，它就会给我以下错误。
Error: Error getting collection: sessions >>
at /home/coeus/Documents/office/members/node_modules/connect-mongostore/lib/connect-mongostore.js:110:22
at Db.collection (/home/coeus/Documents/office/members/node_modules/connect-mongostore/node_modules/mongodb/lib/mongodb/db.js:526:27)
at MongoStore.getCollection (/home/coeus/Documents/office/members/node_modules/connect-mongostore/lib/connect-mongostore.js:109:13)
at MongoStore.get (/home/coeus/Documents/office/members/node_modules/connect-mongostore/lib/connect-mongostore.js:133:10)
at session (/home/coeus/Documents/office/members/node_modules/express-session/index.js:474:11)
at session (eval at createToggleWrapper (/home/coeus/Documents/office/members/node_modules/meddleware/index.js:133:12), :1:68)
at Layer.handle [as handle_request] (/home/coeus/Documents/office/members/node_modules/express/lib/router/layer.js:95:5)
at trim_prefix (/home/coeus/Documents/office/members/node_modules/express/lib/router/index.js:317:13)
at /home/coeus/Documents/office/members/node_modules/express/lib/router/index.js:284:7
at Function.process_params (/home/coeus/Documents/office/members/node_modules/express/lib/router/index.js:335:12)
at next (/home/coeus/Documents/office/members/node_modules/express/lib/router/index.js:275:10)
at /home/coeus/Documents/office/members/node_modules/connect-flash/lib/flash.js:21:5
at flash (eval at createToggleWrapper (/home/coeus/Documents/office/members/node_modules/meddleware/index.js:133:12), :1:66)
at Layer.handle [as handle_request] (/home/coeus/Documents/office/members/node_modules/express/lib/router/layer.js:95:5)
at trim_prefix (/home/coeus/Documents/office/members/node_modules/express/lib/router/index.js:317:13)
at /home/coeus/Documents/office/members/node_modules/express/lib/router/index.js:284:7