Tiny3D Sample not building at all

Hi! I could really use your help as I am just trying to Build one of the sample Tiny projects: Tiny3d...
I have been trying since yesterday and I always get an Error... I use Unity 2020.1.17f1.
I want to build for IOS and get this cryptic error message:

Code (CSharp):

1. Build iOS failed after 13.05s.
2. [             ] Require frontend run.  tundra_tiny3d-ios_v1i.dag no longer valid. FileSignature timestamp changed: ../../../../../../AppData/Local/Stevedore/artifacts/il2cpp/20.10.27_718bbef01fa5971e7ec3f58682d144b59a9c639c888732feea8de04cb0f14677.7z
3. *** buildprogram build success (0.06 seconds), 0 items updated, 13 evaluated
4. [       8s] Executed build program. Created build graph with 1224 nodes.
5. tundra: error: unable to map tiny3d-ios to any named node or input/output file
6. maybe you meant:
7. - tiny3d-asmjs
8. [           0s] Freezing tundra_tiny3d-ios_v1i.dag.json into .dag (.dag file didn't exist)
9.  
10. UnityEngine.Debug:LogError(Object, Object)
11. Unity.Build.ResultBase:LogResult() (at C:/Users/Christian/Documents/UNITY PROJECTS/ProjectTinySamples-master/Tiny3D/Library/PackageCache/com.unity.platforms@0.10.0-preview.10/Editor/Unity.Build/ResultBase.cs:65)
12. Unity.Build.Editor.<>c:<.cctor>b__34_0(BuildConfiguration) (at C:/Users/Christian/Documents/UNITY PROJECTS/ProjectTinySamples-master/Tiny3D/Library/PackageCache/com.unity.platforms@0.10.0-preview.10/Editor/Unity.Build.Editor/BuildConfigurationInspector.cs:42)
13. Unity.Build.Editor.<>c__DisplayClass30_0:<Build>b__1() (at C:/Users/Christian/Documents/UNITY PROJECTS/ProjectTinySamples-master/Tiny3D/Library/PackageCache/com.unity.platforms@0.10.0-preview.10/Editor/Unity.Build.Editor/BuildConfigurationInspector.cs:128)
14. UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&)
15.  

Does anybody have any idea what I can do to make it work. I tried the IOS Build on a Windows machine and on an IMac.

Update: for Win-DotNet, Android and Asmjs the Build works, because the path to my project was too long-.- So the big problem is IOS.

Thank you!