This question is related to the ArcGIS Next-Gen connector (DUI3 | Next-Gen Connector Announcement, Next-Gen Connectors | What app we should add next?)
Problem:
Nothing gets send to Speckle, because I’m getting the error: “Value cannot be null.” even though I have a layer selected that contains lots of data:
I’d be happy to share the ArcGIS Project with symbology and underlying GeoPackage that contains the actual GIS data if you’d tell me how to most easily do that. Is there a handy way of packaging an ArcGIS project + data?
Please also let me know how I can get to the underlying error traceback, such that we can resolve this issue together 
Oh no! Where is your project stored? Is it a non-writeable location like Google Drive or something?
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Ah, maybe that’s the problem?!?
I do use this “Mirror files” option though:
Which means that my ArcGIS project is in this location, and not on some network drive P: or R: or something like that:
C:\Users\me\GoogleDrive\Bedrock\Case Studies\KaiTak\GIS\KaiTak.aprx
This KaiTak.aprx ArcGIS project then connects to a GeoPackage which I have stored here:
C:\Users\joost\ReposWindows\bedrock-gi\sandbox\kaitak_gi.gpkg
So everything is just on my C: drive, right?
Aha. This is definitely the issue. Good news, I solved it recently and we will make a new release today, I’ll ping you when it’s out!
Amazing.
Thanks once again for the always amazing help!
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speckle-releases beta 208 should fix the issue 
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Awesome, worked indeed!
https://app.speckle.systems/projects/013aaf06e7/models/902b2a4f95,ffdcc8e820
Did get this message, which I didn’t really understand very well:
Maybe change the wording a bit so it’s clearer what the problem / warning is?
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Thanks! Found the issue - solution will be in the new release If you need colors right now, they should be working for MultiPoint type of layers
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Fantastic! Next release is fine 
I’ll let you know if I find any other bugs or other stuff.
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