Hello.
I get this error d8 too !!! I tried to remove all extensions, one by one and compil each time, always error ! But if a start a new project with nothing, just my differents extensions loaded (not used), no problem. It will be hard to find the problem i think ...
Sorry for my bad english 
There can be lots of reasons to get a d8 error. Usually "too much of something"
Upload your app to https://unchive.kodular.io to get some statistics of your project and post the statistics overview
Taifun
Sorry, I didn't see that you were going to move the post to a new topic. I'm not used to this type of forum! So I'm pasting the answer I posted on the other topic.
[quote]
Thanks for your reply.
I don't know what you want exactly and how get it to post here ? I took screenshots, but not sure it is what you need ? I tried to download summary, but nothing happen !
google traduction:
For information, I wanted to use this extension to easily adjust the margins of the different components and I also found it practical to be able to adjust the opacity of an element easily. If it doesn't work, too bad, I'll do it the old way, add components to make margins, and play with the colors to have an opacity effect... [/quote]
In your case my guess is, 2 extensions are using the same library which causes a conflict
Taifun
Thanks. As I said on my first post, I removed all the extensions one at a time, and still an error. For my next project, I will start from the beginning with this extension, and compile regularly to see! I finished my current application, just cosmetic, but for a first, if it is not perfect, it will be fine 