Error: Couldn't resolve Demo Web API interfaces

I've recently been getting this error every few seconds on most of my projects, and the continual opening of the dialog box prevents me from being able to use Logic in any meaningful way. It happens specifically when using Rosetta (I'm on an M1 Mac Mini); when I open Logic in normal mode it crashes anytime I open one of those projects.


I recently installed some new plug-ins (including a few demos) but the first thing I tried was uninstalling them (removing all their files from my Library) but that didn't seem to help.


Logic 10.6.3

MacOS 11.3

Mac Mini M1, 2020


Thank you!

Mac mini 2018 or later

Posted on May 8, 2022 5:15 PM

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Question marked as Top-ranking reply

Posted on May 9, 2022 12:00 PM

Hi nychthemerons


Ive had the same issue and after a painful afternoon (and help of Logic X Facebook group) found a solution.


Do you have BFD?. Basically it was BFD that was causing this (maybe it is one of your other, older plug ins too).


If so i had to migrate my BFD account over to inMusic from FXpansion. Once done i found a newer installer for BFD3 which seems to have fixed the issue. I did this via my FXPansion account.


I hope you find a solution too.


5 replies
Question marked as Top-ranking reply

May 9, 2022 12:00 PM in response to nychthemerons

Hi nychthemerons


Ive had the same issue and after a painful afternoon (and help of Logic X Facebook group) found a solution.


Do you have BFD?. Basically it was BFD that was causing this (maybe it is one of your other, older plug ins too).


If so i had to migrate my BFD account over to inMusic from FXpansion. Once done i found a newer installer for BFD3 which seems to have fixed the issue. I did this via my FXPansion account.


I hope you find a solution too.


Jun 15, 2022 4:45 PM in response to Slinn123

It is complicated

you have to transfer bfd3 to inmusic

they give you a new serial number

sign up for the forum at bfddrums.com

read messages and like posts until you can pm drew then you pm him with your old fxpansion login id your new inmusic id and the serial numbers for bfd1 and 2 to get the corresponding expansion packs .

the upside is they give you a free expansion pack for your trouble jazz noir or a few others

tbh I am waiting for drew to get back to me for london sessions which is 2 and whatever 1 is called

also if you dont own the older ones you can skip the forum part

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Error: Couldn't resolve Demo Web API interfaces

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