404 cant find error in uipath

your folder is too big - in my case somehow email downloads were happening inside the folder

VDI black screen

turn off Tablet PC Input Service 

stepping in UIpath

when you enter the activity, it is run , not when you leave it

UI Path bug (IMHO)

if you invoke a file and the path is wrong no error will be raised

specified element is already the logical child of another element-disconnect it first

close and reopen

nullable int which is key in dapper and getting casting errors?

do this

[ExplicitKey]
        [Computed]

see why POST data is null

 public int SaveBlah([FromBody] Object blah)
        {
             var jsonString = blah.ToString();
             Blah result = JsonConvert.DeserializeObject<B;ah>(jsonString);
}