Build tool updates and NullreferenceExceptions

hello and thank you for reading. in this issue i'll walk through my process and why i cant seem to run this project. I'm unable to reproduce my initial issue. so at the end i try to recount that as best i can. if anyone has Hints and or steps i can use please notify me!

I'm using:

VS2019
Unity 2019.4.20f1/ 2020.3.0f1
the RS4 link results in an error 404 and my windows OS should be up to date
i would like to detect markers from the 4X4_50 dictionary.

I am not doing the optional building the project from source steps.

my exact steps:

git clone the repo
CD into repo
git submodule update --init these are all the mentioned steps necessary.

i have done camera calibration before to do some native ArUco tracking. these are my HoloLens2 values:

Running an example

from here there are no exact steps for running the scenes and i use the general setup guide from the MRTK tutorials https://docs.microsoft.com/en-us/windows/mixed-reality/develop/unity/tutorials/mr-learning-base-02

step 1: adding the project in unity Hub i simply navigate to the project folder and select C:\UNITYPROJECTS\ubiquitous_computing\ArUcoDetectionHoloLens-Unity\ArUcoDetectionHoloLensUnity

step 2: update and open the used unity version is a bit outdated. here i switch it to a slightly newer 2019 LTS version normally. in this trail run i'm trying the 2020 LTS version

this looks like a mistake as it results in various errors

i'll retry using the 2019.4.20f1 LTS version this time i'll attach the updrade.log file No errors this time! Packages-Update.log i realise now that this might explain later errors.

step 3: building the unity project

first i enter the calibration data into the inspector of the script holder object. However, i won't arrive at a point where this could be an issue.
then i got to file -> buildsettings and switch to the UWP platform
then i use the most fitting settings and build

Issues and how i handle them

issue 1 the built UWP project .sln when opened in VS2019 is not loaded

C:\UNITYPROJECTS\ubiquitous_computing\ArUcoDetectionHoloLens-Unity\ArUcoDetectionHoloLensUnity\build\ArUcoDetectionHoloLensUnity\ArUcoDetectionHoloLensUnity.vcxproj : error  : The application for the project is not installed.

here i choose to reload with dependencies which causes an error

C:\UNITYPROJECTS\ubiquitous_computing\ArUcoDetectionHoloLens-Unity\ArUcoDetectionHoloLensUnity\build\ArUcoDetectionHoloLensUnity\ArUcoDetectionHoloLensUnity.vcxproj : error  : Cannot load project with duplicated project items: C:\UNITYPROJECTS\ubiquitous_computing\ArUcoDetectionHoloLens-Unity\ArUcoDetectionHoloLensUnity\build\ArUcoDetectionHoloLensUnity\opencv_world3411.dll is included as 'None' and as 'None' item types.

this isn't my original issue but it seems I've failed to reproduce it. Still an issue non the less.

Thank you to any who could help me with this issue!

[edit] description of earlier issues. from memory and older pictures! only usefull as context!!

I used to be able to reload the project. When i would try to build and deploy VS19 would warn me my build tools were outdated and MUST be updated. Doing so resulted in a warning when building (luckily isaved an image of this)

i tried to see what happens when i ignore this warning.

this resulted in an architecture mismatch i think i navigated to the opencv submodule and copied the ARM dll and winmd but cannot be sure.

eventually i could deploy the example but it threw a NullReference exception. I am looking forward to any kind of input you could give me.

doughtmw / ArUcoDetectionHoloLens-Unity