Evalscript Error for no reason on Extendscript [PPRO]

I'm developing a CEP Extension for Premiere pro however, Extendscript doesn't seem stable for some reason. Even one line codes fails time to time.

For example;

app.project.rootItem.createBin("Folder");

 
It should createa bin named "Folder" in top level with no issue no matter what, however sometimes it just fails and decides not to.

I have used ExtendScript Developer Tools to test, however Extendscript has same behaviour on my CEP Panel as well. 

Example outputs ;

> app.project.rootItem.createBin("Folder");
[object ProjectItem]
> app.project.rootItem.createBin("Folder");
EvalScript error.
> app.project.rootItem.createBin("Folder");
[object ProjectItem]
> app.project.rootItem.createBin("Folder");
[object ProjectItem]
> app.project.rootItem.createBin("Folder");
EvalScript error.
> app.project.rootItem.createBin("Folder");
[object ProjectItem]
> app.project.rootItem.createBin("Folder");
[object ProjectItem]
> app.project.rootItem.createBin("Folder");
EvalScript error.