Script Error - TypeError: Unable to get property 'Initialize' of undefined or null reference at eval code (eval code:1:1)

Hello,

I have a problem when I open an Account record.

The Log file of the error is:

TypeError: Unable to get property 'Initialize' of undefined or null reference

at eval code (eval code:1:1)

at RunHandlerInternal (server/.../ClientApiWrapper.aspx)

at RunHandlers (server/.../ClientApiWrapper.aspx)

at OnScriptTagLoaded (server/.../ClientApiWrapper.aspx)

at Anonymous function (server/.../ClientApiWrapper.aspx)

I know that to "fix" this error I can turn on "Legacy Form Rendering", but I wonder what is the cause of this error and how can I fix it in another manner.

I found another post where the error appears when the Scripts on the Form are written badly. I have read all the scripts and they are all OK.

Here says that I must have Read privilege on Process in order to access Business Rules on the entity. The problem is that even though I am System Administrator I still receive the error.

Do you have any ideas on this? Where can be the problem? Why does "Legacy Form Rendering" fixes it? What can I do to fix the error?