Plug-In Trace Log - Error message

Hi Team,

Recently, when I tried to modify an existing workflow in Dynamics CRM Online, I received the following error message:  "Invalid Argument".

I don't find any details about this error in the Plug-In Trace Log:

Settings > Customization > Plug-In Trace Log

That is the reason why I submitted a ticket at the Dynamics CRM Support Team. I have the response after one day, they told me to delete a specific field in the opportunity form and it is OK now.

My question is: Why Plug-In Trace Log can't give any information about errors?

I see in many blogs that people have the same remark as me.

Thank you in advance,

Akrem