Onload in _ onopen.htm java script error(s) – Dreamweaver

Hello TechyV buddies!
I am having some problem with loading Dreamweaver.
Whenever I open it, always encounter an error. The error is this:
Dreamweaver
While Executing onLoad in _onOpen.htm, the following JavaScript error(s) occurred:
In file "_onOpen";
onOpen is not defined
Can anyone help me configure this problem?
I am not sure what could have caused this issue.
If there is anyone there who has knowledge about this please don’t be hesitant to share it.
Thank you!
