F:1 .. Unable to remove NM_run1 directory:

[Kevindooo]

Dear Support，

当我使用pirana的execute功能后，我会在窗口中看到这样的文字，为何会出现这样的文字？如何解决？
When I use Pirana's execute feature, I see this text in the window, why does it appear? How to fix it?

Done with nonmem execution
F:1 .. Unable to remove NM_run1 directory: Directory not empty . at E:/PsN-5.3.1/strawberry/perl/bin/..\site\lib\PsN_5_3_1/tool/modelfit.pm line 757.

execute done