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ERIKA SAUNDERSONERIKA SAUNDERSON 

I have followed the following intsructions to display "Open Activities" as the first item on the Accounts record details page, but I keep getting the following error messages:

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Raj VakatiRaj Vakati
Can you share the screenshoot ? 

Or If all steps is correct then try to create new Playgroud org and try again
SandhyaSandhya (Salesforce Developers) 
Hi,

If you have record types setup on Account's remove them from accounts.

Goto Accounts->Editlayout->Relatedlist:
 Goto Openactivities in down  just scroll on Open activities on Related contact or Contact then save.

Please mark it as solved if my reply was helpful. It will make it available for other as the proper solution.
                                             
Best Regards
Sandhya