Custom Workflow - An error has occurred in

HI All

I am in Sharepoint  Online Evironment.

I have workflow which will create a SubSite. using a custom create site action.

But  when i trigger workflow i am getting the above error sometimes.

Out 10 times 3 times the WF is Falling but the Subsite is getting created.

I do not have acess to 14 hive.

Any help is Appreciated.

Thanks and regards

R PRashanth Kumar