I dont know why my Timer Schedule doesn’t work, any thoughts? [closed]

this is my first question in Stack Overflow. Im currently working on a really small program that reminds you of activities that you typed in.

But I dunno why the last part doesn’t work (t.schedule(tsk,ttt)). Since im fairly new with coding, I know I did something wrong or Im lacking some code, I just don’t know what. Any thoughts?enter image description here