Monostable and Astable 555 Timer
1) Your LED current limiting resistors should be 300 ohms instead of 330k ohms.

2) DIS should be connected to THR, not to TRG.

3) VS1 should be a voltmeter, not a voltage source.

4) The connection to the junction of R4 and C1 should be made at the dot.

5) There needs to be 0.1µF between U1 pins 1 and 8. (Real World)

6) Why is the battery a MOSFET?