Error with Collab

[Plasmatical]

I downgraded project idiotically from 2020.1 to 2019.3.0 and now I get the error message
Library\PackageCache\com.unity.collab-proxy@1.3.5\Editor\Models\Providers\Collab.cs(109,22): error CS1061: ‘Collab’ does not contain a definition for ‘RevisionUpdated_V2’ and no accessible extension method ‘RevisionUpdated_V2’ accepting a first argument of type ‘Collab’ could be found (are you missing a using directive or an assembly reference?)

Is there any fix?

[richardzzzarnold]

I have done exactly the same thing.
And I also have exactly the same problem.

[dgoyette]

Downgrading is not officially supported, but this sounds like you just need to delete the “Library” directory in your project. It probably has some junk in it that’s 2020 specific. Delete “Library” while the project is closed, and Unity will rebuild it the next time you open the project. Note that depending on how big your project is, that could take a while.

[dansopanso]

@dgoyette

Downgrading is not officially supported, but this sounds like you just need to delete the “Library” directory in your project. It probably has some junk in it that’s 2020 specific. Delete “Library” while the project is closed, and Unity will rebuild it the next time you open the project. Note that depending on how big your project is, that could take a while.

Tried that but does not fix the error

[Virgule]

I had the same the same problem while downgrading Unity 2020.1 to 2019.3. Downgrading the package “Unity.Collaboration” to 1.2.16 fixed the errors. Look into the package manager (Window/Package Manager).

Note that I had multiple other mysterious errors after the downgrade. It was all package version related. I fixed them one by one by finding which packages need to downgrade too.

[luki_riehen]

@Virgule

I had the same the same problem while downgrading Unity 2020.1 to 2019.3. Downgrading the package “Unity.Collaboration” to 1.2.16 fixed the errors. Look into the package manager (Window/Package Manager)…

1000 thanks it works!

[salharbi1888]

@Virgule

I had the same the same problem while downgrading Unity 2020.1 to 2019.3. Downgrading the package “Unity.Collaboration” to 1.2.16 fixed the errors. Look into the package manager (Window/Package Manager).

Note that I had multiple other mysterious errors after the downgrade. It was all package version related. I fixed them one by one by finding which packages need to downgrade too.

thanks it works

[flippedBrain]

I had so many errors with my current project in 2020.1 that I downgraded back to 2019.4 (idiotically without making a backup before)

Thanks for the tipp with the Package Manager. That solved most of the problems for me.

[WinStudios]

Hello Guys I had same problem after I downgraded Unity from 2020 to 2019 version and I faced whole this shit. But here I have found solution for it. Go to Package Manager click on Advanced tab and than click on (Reset Packages to default) it fixed all my errors. Hope this method will works for you as well.

[yohosuff]

I ended up having to downgrade the following packages to get rid of the compiler errors.

[Twelewen]

@Virgule

I had the same the same problem while downgrading Unity 2020.1 to 2019.3. Downgrading the package “Unity.Collaboration” to 1.2.16 fixed the errors. Look into the package manager (Window/Package Manager).

Note that I had multiple other mysterious errors after the downgrade. It was all package version related. I fixed them one by one by finding which packages need to downgrade too.

Thank you so much for the fix!
I am back to working 2019.4.4.
!!!Such a relief!!!

[NoStyle]

@WinStudios

Hello Guys I had same problem after I downgraded Unity from 2020 to 2019 version and I faced whole this S***. But here I have found solution for it. Go to Package Manager click on Advanced tab and than click on (Reset Packages to default) it fixed all my errors. Hope this method will works for you as well.

This also solved my problem!
I was trying to start the tutorial “Creator Kit:FPS” When I started this from tutorials in Hub it opened in Unity 2020. When I started the ExampleScene I only got a black screen. Then I created a 2019 project and imported the “Creator Kit:FPS” Asset (from windows-Asset Store) Now Igot a lot off compiler errors.

But the Reset Packages to default did the trick

Thanks a lot!

[eijio]

@Virgule

I had the same the same problem while downgrading Unity 2020.1 to 2019.3. Downgrading the package “Unity.Collaboration” to 1.2.16 fixed the errors. Look into the package manager (Window/Package Manager).

Note that I had multiple other mysterious errors after the downgrade. It was all package version related. I fixed them one by one by finding which packages need to downgrade too.

thanks a lot!!

PackageManager >Advanced> Reset Package to default

its fixed

[muhsingcu]

@eijio

thanks a lot!!

PackageManager >Advanced> Reset Package to default

its fixed

it’s working.thanks

[Veyron104]

@Virgule

I had the same the same problem while downgrading Unity 2020.1 to 2019.3. Downgrading the package “Unity.Collaboration” to 1.2.16 fixed the errors. Look into the package manager (Window/Package Manager).

Note that I had multiple other mysterious errors after the downgrade. It was all package version related. I fixed them one by one by finding which packages need to downgrade too.

1 million thanks !)

[zeldatechnologies]

@Virgule

I had the same the same problem while downgrading Unity 2020.1 to 2019.3. Downgrading the package “Unity.Collaboration” to 1.2.16 fixed the errors. Look into the package manager (Window/Package Manager).

Note that I had multiple other mysterious errors after the downgrade. It was all package version related. I fixed them one by one by finding which packages need to downgrade too.

Thanks Alot You Save My Time

[sabint]

Stumbled upon this as well. In general, it’s a good idea to look for the name of the package in the error console, and then install a “verified” version of the problem package. Package manager provides a little arrow icon to show what verified version is available.

[kkeerthi]

Downgrading the project from 2020.3 to 2019.4 threw errors .

SOLUTION:

Windows → Package Manager-> Advanced->Reset packages to defaults.

It fixed my errors and now the project works !!!

[HunterAhlquist]

I tried everything here, both the current verified version of Timeline and Collab are throwing errors in Unity 2020.3.13f1.

I should add that I’m not downgrading, I upgraded from 2019.4 LTS to 2020.3 LTS

Timeline package errors:
Library\PackageCache\com.unity.timeline@1.4.8\Editor\Animation\BindingTreeViewDataSource.cs(195,37): error CS0433: The type '(T1, T2)' exists in both 'System.ValueTuple, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' and 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

Library\PackageCache\com.unity.timeline@1.4.8\Editor\Animation\BindingTreeViewDataSource.cs(209,16): error CS0433: The type '(T1, T2)' exists in both 'System.ValueTuple, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' and 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

Collab/Version control package errors:
Library\PackageCache\com.unity.collab-proxy@1.5.7\Editor\Collaborate\Components\AlertBox.cs(75,97): error CS8137: Cannot define a class or member that utilizes tuples because the compiler required type 'System.Runtime.CompilerServices.TupleElementNamesAttribute' cannot be found. Are you missing a reference?

Library\PackageCache\com.unity.collab-proxy@1.5.7\Editor\Collaborate\Components\AlertBox.cs(75,97): error CS8356: Predefined type 'System.ValueTuple`2' is declared in multiple referenced assemblies: 'System.ValueTuple, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' and 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

Library\PackageCache\com.unity.collab-proxy@1.5.7\Editor\Collaborate\Utilities\MenuUtilities.cs(37,23): error CS8137: Cannot define a class or member that utilizes tuples because the compiler required type 'System.Runtime.CompilerServices.TupleElementNamesAttribute' cannot be found. Are you missing a reference?

Library\PackageCache\com.unity.collab-proxy@1.5.7\Editor\Collaborate\Utilities\MenuUtilities.cs(37,23): error CS8356: Predefined type 'System.ValueTuple`2' is declared in multiple referenced assemblies: 'System.ValueTuple, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' and 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

Library\PackageCache\com.unity.collab-proxy@1.5.7\Editor\Collaborate\Models\IMainModel.cs(106,9): error CS8137: Cannot define a class or member that utilizes tuples because the compiler required type 'System.Runtime.CompilerServices.TupleElementNamesAttribute' cannot be found. Are you missing a reference?

Library\PackageCache\com.unity.collab-proxy@1.5.7\Editor\Collaborate\Models\IMainModel.cs(106,9): error CS8356: Predefined type 'System.ValueTuple`3' is declared in multiple referenced assemblies: 'System.ValueTuple, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' and 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

Library\PackageCache\com.unity.collab-proxy@1.5.7\Editor\Collaborate\Models\MainModel.cs(154,16): error CS8137: Cannot define a class or member that utilizes tuples because the compiler required type 'System.Runtime.CompilerServices.TupleElementNamesAttribute' cannot be found. Are you missing a reference?


Library\PackageCache\com.unity.collab-proxy@1.5.7\Editor\Collaborate\Models\MainModel.cs(154,16): error CS8137: Cannot define a class or member that utilizes tuples because the compiler required type 'System.Runtime.CompilerServices.TupleElementNamesAttribute' cannot be found. Are you missing a reference?

And many many more...

[aaldere1]

@sabint

Stumbled upon this as well. In general, it’s a good idea to look for the name of the package in the error console, and then install a “verified” version of the problem package. Package manager provides a little arrow icon to show what verified version is available.

Doing this on the package worked for me.