Can't update data based on id using express+mongo+node

I'm a totally newbie in node/express/mongo. I'm trying to learning but a single error is finishing my day. Don't know why. Googled it a lot still can't find any proper solution. Following is my code from pastebin where you can find my code.

https://pastebin.com/kZLHAA5k

I've the following error occurs all the time though I'm getting the id parameter from url using objectID for mongo. Can you please help me here...

Error: 
Error: Argument passed in must be a single String of 12 bytes or a string of 24 hex characters
at new ObjectID (c:\Users\AD LORD\Desktop\learning-node\node_modules\bson\lib\bson\objectid.js:50:11)
at ObjectID (c:\Users\AD LORD\Desktop\learning-node\node_modules\bson\lib\bson\objectid.js:31:42)
at app.get (c:\Users\AD LORD\Desktop\learning-node\server.js:35:44)
at Layer.handle [as handle_request] (c:\Users\AD LORD\Desktop\learning-node\node_modules\express\lib\router\layer.js:95:5)
at next (c:\Users\AD LORD\Desktop\learning-node\node_modules\express\lib\router\route.js:137:13)
at Route.dispatch (c:\Users\AD LORD\Desktop\learning-node\node_modules\express\lib\router\route.js:112:3)
at Layer.handle [as handle_request] (c:\Users\AD LORD\Desktop\learning-node\node_modules\express\lib\router\layer.js:95:5)
at c:\Users\AD LORD\Desktop\learning-node\node_modules\express\lib\router\index.js:281:22
at param (c:\Users\AD LORD\Desktop\learning-node\node_modules\express\lib\router\index.js:354:14)
at param (c:\Users\AD LORD\Desktop\learning-node\node_modules\express\lib\router\index.js:365:14)

via tanim