I am using Multisim 14.2 . I was trying to simulate the last example of the Power Converter sample circuits...and after few seconds of simulation..the cursor shows a loading symbol and then it crashes and quits out . Can any one suggest how can I fix this ?

Mod: link to old thread
https://forum.allaboutcircuits.com/threads/covergense-problem-in-multisim.124969/post-1009798

 

If someone says the last file, I see "Push-Pull isolated Buck Converter" it runs with the default shown below.
The circuit is taking 100V DC converting it to 25V 7.5A rms 120 kHz Sine into a 10Ω load

open "Simulate" which opens a drop down menu and select "Analyses and simulation"
carefully look for 3 tabs... choose the 3rd tab "Analysis options" and select "use custom settings" press "Customize"
This is where scope convergence can be customized. The default can be too tight. ABSTOL RETOL RSHUNT
There is a button at the bottom that restores the default which is this.