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Fixed in 2017.3.0f3

Fixed in 5.6.X, 2017.1.X, 2017.2.X



Found in


Issue ID




Visual Studio throws the "Unable to step" error when stepping over the code



Steps to reproduce:
1. Open the attached project (
2. Open the test scene
3. Open the test.cs script in Visual Studio 2015/2017
4. Put a breakpoint on the lines 10 and 14
5. Attach to Unity and Play
6. Inspect the variable r when the breakpoint is hit
7. Step over until you will get an error
8. Observe the error:
Unable to step. Operation is not supported

Expected result: You should be able to debug the code
Actual result: Visual studio throws the error message

Reproduced with: 5.4.5p2, 5.5.3p4, 5.6.1p1, 2017.1.0b6

Fixed in: 2017.3.0b1
Bacported to: 5.6.3p4, 2017.1.1p2, 2017.2.0b11

Comments (2)

  1. sailro

    May 30, 2017 21:37

    With 2017.1.0b7 it works as expected with the new experimental runtime (same issue with the legacy one). But if you try to stop/start the game several times, Unity will crash. (perhaps another unrelated issue).

  2. sailro

    May 30, 2017 20:48

    I am able to reproduce this behavior both with VSTU and MonoDevelop. So it seems to be an issue with the stepping on the Unity side.

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