Search Issue Tracker
Won't Fix
Votes
1
Found in
2017.1.0b1
Issue ID
905072
Regression
Yes
Error appears when project is opened with a newer version, and script with error is deleted, and a new script is created
To reproduce:
1. Open attached project with Unity 2017.1.0b4
2. Delete "NewBehaviourScript.cs"
3. Create a new C# script.
To reproduce from scratch:
1. Create new project with Unity 2017.1.0b1 (or older)
2. Create a new C# Script.
3. Make sure C# script has an error.
4. Close Unity.
5. Open Same project with 2017.1.0b2 (or newer)
6. Delete that script.
7. Create a new C# script.
Expected result: No errors.
Actual result: An error appears.
Reproducible:
5.5.0a6 - 5.5.3p2 (error appears if previous project was made with 5.4.0b14 or older)
5.6.0a2 - 5.6.0p3 (error appears if previous project was made with 5.4.0b14 or older)
2017.1.0a2, 2017.1.0b4 (with any previous version)
2017.2.1p1
2017.3.2f1
2017.4.9f1
2018.1.0b6
Did not reproduce:
5.3.7p1
5.4.5p1
2018.1.9f1
2018.2.2f1
2018.3.0a8
Error message
:error CS1704: An assembly with the same name `UnityEngine.UI' has already been imported. Consider removing one of the references or sign the assembly
E:/Unity/Unity 2017.1.0b2/Editor/Data/UnityExtensions/Unity/GUISystem/UnityEngine.UI.dll (Location of the symbol related to previous error)
E:/Unity/Unity 2017.1.0b2/Editor/Data/UnityExtensions/Unity/GUISystem/Standalone/UnityEngine.UI.dll (Location of the symbol related to previous error)
error CS1704: An assembly with the same name `UnityEngine.Networking' has already been imported. Consider removing one of the references or sign the assembly
E:/Unity/Unity 2017.1.0b2/Editor/Data/UnityExtensions/Unity/Networking/UnityEngine.Networking.dll (Location of the symbol related to previous error)
E:/Unity/Unity 2017.1.0b2/Editor/Data/UnityExtensions/Unity/Networking/Standalone/UnityEngine.Networking.dll (Location of the symbol related to previous error)
error CS1703: An assembly `nunit.framework' with the same identity has already been imported. Consider removing one of the references
E:/Unity/Unity 2017.1.0b2/Editor/Data/UnityExtensions/Unity/TestRunner/nunit.framework.dll (Location of the symbol related to previous error)
E:/Unity/Unity 2017.1.0b2/Editor/Data/UnityExtensions/Unity/TestRunner/standalone/nunit.framework.dll (Location of the symbol related to previous error)
error CS1704: An assembly with the same name `UnityEngine.Timeline' has already been imported. Consider removing one of the references or sign the assembly
E:/Unity/Unity 2017.1.0b2/Editor/Data/UnityExtensions/Unity/Timeline/RuntimeEditor/UnityEngine.Timeline.dll (Location of the symbol related to previous error)
E:/Unity/Unity 2017.1.0b2/Editor/Data/UnityExtensions/Unity/Timeline/Runtime/UnityEngine.Timeline.dll (Location of the symbol related to previous error)
error CS1704: An assembly with the same name `UnityEngine.HoloLens' has already been imported. Consider removing one of the references or sign the assembly
E:/Unity/Unity 2017.1.0b2/Editor/Data/UnityExtensions/Unity/UnityHoloLens/Runtime/UnityEngine.HoloLens.dll (Location of the symbol related to previous error)
E:/Unity/Unity 2017.1.0b2/Editor/Data/UnityExtensions/Unity/UnityHoloLens/RuntimeEditor/UnityEngine.HoloLens.dll (Location of the symbol related to previous error)
Compilation failed: 5 error(s), 0 warnings
-
yoyobbi
Mar 01, 2019 22:09
The full error is as follows. Something is messed up with built-in package management. I haven't yet figured out a workaround:
error CS1704: An assembly with the same name `UnityEngine.UI' has already been imported. Consider removing one of the references or sign the assembly
C:/Program Files/Unity/Hub/Editor/2018.2.15f1/Editor/Data/UnityExtensions/Unity/GUISystem/UnityEngine.UI.dll (Location of the symbol related to previous error)
C:/Program Files/Unity/Hub/Editor/2018.2.15f1/Editor/Data/UnityExtensions/Unity/GUISystem/Standalone/UnityEngine.UI.dll (Location of the symbol related to previous error)
error CS1704: An assembly with the same name `UnityEngine.Timeline' has already been imported. Consider removing one of the references or sign the assembly
C:/Program Files/Unity/Hub/Editor/2018.2.15f1/Editor/Data/UnityExtensions/Unity/Timeline/RuntimeEditor/UnityEngine.Timeline.dll (Location of the symbol related to previous error)
C:/Program Files/Unity/Hub/Editor/2018.2.15f1/Editor/Data/UnityExtensions/Unity/Timeline/Runtime/UnityEngine.Timeline.dll (Location of the symbol related to previous error)
error CS1704: An assembly with the same name `UnityEngine.Networking' has already been imported. Consider removing one of the references or sign the assembly
C:/Program Files/Unity/Hub/Editor/2018.2.15f1/Editor/Data/UnityExtensions/Unity/Networking/UnityEngine.Networking.dll (Location of the symbol related to previous error)
C:/Program Files/Unity/Hub/Editor/2018.2.15f1/Editor/Data/UnityExtensions/Unity/Networking/Standalone/UnityEngine.Networking.dll (Location of the symbol related to previous error)
error CS1704: An assembly with the same name `UnityEngine.GoogleAudioSpatializer' has already been imported. Consider removing one of the references or sign the assembly
C:/Program Files/Unity/Hub/Editor/2018.2.15f1/Editor/Data/UnityExtensions/Unity/UnityGoogleAudioSpatializer/Runtime/UnityEngine.GoogleAudioSpatializer.dll (Location of the symbol related to previous error)
C:/Program Files/Unity/Hub/Editor/2018.2.15f1/Editor/Data/UnityExtensions/Unity/UnityGoogleAudioSpatializer/RuntimeEditor/UnityEngine.GoogleAudioSpatializer.dll (Location of the symbol related to previous error)
error CS1704: An assembly with the same name `UnityEngine.HoloLens' has already been imported. Consider removing one of the references or sign the assembly
C:/Program Files/Unity/Hub/Editor/2018.2.15f1/Editor/Data/UnityExtensions/Unity/UnityHoloLens/Runtime/UnityEngine.HoloLens.dll (Location of the symbol related to previous error)
C:/Program Files/Unity/Hub/Editor/2018.2.15f1/Editor/Data/UnityExtensions/Unity/UnityHoloLens/RuntimeEditor/UnityEngine.HoloLens.dll (Location of the symbol related to previous error)Compilation failed: 5 error(s), 0 warnings
-
yoyobbi
Mar 01, 2019 22:06
Getting this error opening an existing project in 2018.2.15f1, after having installed a second copy of 2018.2.15f1 with il2cpp support enabled. Can't open the existing (Mono-based) project in either instance.
-
cgrow67
Aug 01, 2018 23:12
Getting this same problem updating from 2018.1.8f1 to 2019.1.9f1
-
mikael_kalms
Feb 06, 2018 12:05
Getting something very similar in 2017.3.0f3 - a collision with UnityEngine.Networking DLL. The project has been upgraded 5.5.0f3 -> 5.6.1f1 -> 2017.1.0f3 -> 2017.3.0f3.
We noticed this problem several weeks after upgrading, when we attempted to build the game on a machine which had both native Windows and the Windows Store build support installed.
Unity QA has confirmed that there is a regression.
-
sosh
Oct 31, 2017 09:49
Getting this in 2017.2.0f3, upgrading project from 5.6
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