[BUG] Blueprint Internal Compiler Error

On Beta 5.

This shows up in Blueprint compiler view and log:

[2809.27][626]BlueprintLog: New page: Compile PersistentLevel_LevelBlueprint
[2809.29][626]LogBlueprint:Error: [compiler] Error Internal compiler error inside CreateExecutionSchedule (site 1); please contact the framework team as we need a repro for this bug!
[2809.29][626]LogBlueprint:Warning: [compiler] Warning [2809.29] Compile of PersistentLevel_LevelBlueprint failed. 1 Fatal Issue(s)  0 Warning(s) [in 9 ms]

And upon restarting the editor, this message is displayed:

Ensure condition failed: ToPin->LinkedTo.Contains(this) [File:D:\BuildFarm\buildmachine_++depot+UE4-Rocket+Beta5\Engine\Source\Runtime\Engine\Private\EdGraph\EdGraph.cpp] [Line: 690]
UEdGraphPin::BreakLinkTo Pin '' on node 'Waveform Manager' not reciprocally linked with pin 'Enter' on node 'Do N'
Stack: Address = 0xe3072a26 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-Core.dll]
Address = 0xe2f8e6c2 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-Core.dll]
Address = 0xe2e77629 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-Core.dll]
Address = 0xe1c08436 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-Engine.dll]
Address = 0xe1c08230 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-Engine.dll]
Address = 0xe0377ff7 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-BlueprintGraph.dll]
Address = 0xe016e2bb (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-KismetCompiler.dll]
Address = 0xe016e536 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-KismetCompiler.dll]
Address = 0xe015caff (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-KismetCompiler.dll]
Address = 0xe015eef3 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-KismetCompiler.dll]
Address = 0xe0152740 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-KismetCompiler.dll]
Address = 0xe01544c9 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-KismetCompiler.dll]
Address = 0xe01540bc (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-KismetCompiler.dll]
Address = 0xe6ac3115 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-UnrealEd.dll]
Address = 0xe0e54331 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-Engine.dll]
Address = 0xe810bde9 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-CoreUObject.dll]
Address = 0xe80bc943 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-CoreUObject.dll]
Address = 0xe80f0a3d (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-CoreUObject.dll]
Address = 0xe81073f4 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-CoreUObject.dll]
Address = 0xe80df244 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-CoreUObject.dll]
Address = 0xe80c7222 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-CoreUObject.dll]
Address = 0xe810bde9 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-CoreUObject.dll]
Address = 0xe80f0c01 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-CoreUObject.dll]
Address = 0xe81073f4 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-CoreUObject.dll]
Address = 0xe80f04f2 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-CoreUObject.dll]
Address = 0xe81085da (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-CoreUObject.dll]
Address = 0xe81cdb99 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-CoreUObject.dll]
Address = 0xe63d567c (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-UnrealEd.dll]
Address = 0xe63c84ed (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-UnrealEd.dll]
Address = 0xe63baba1 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-UnrealEd.dll]
Address = 0xe6650a82 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-UnrealEd.dll]
Address = 0xe641ca17 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-UnrealEd.dll]
Address = 0xda7b29b8 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-LevelEditor.dll]
Address = 0xda788a6a (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-LevelEditor.dll]
Address = 0xe79d92a0 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-Slate.dll]
Address = 0xe7c22a1a (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-Slate.dll]
Address = 0xe7c26568 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-Slate.dll]
Address = 0xe7c0912c (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-Slate.dll]
Address = 0xe79d879a (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-Slate.dll]
Address = 0xe7a00a9e (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-Slate.dll]
Address = 0xe7a7ac1d (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-Slate.dll]
Address = 0xe7a732d1 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-Slate.dll]
Address = 0xe302cba2 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-Core.dll]
Address = 0xe301f826 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-Core.dll]
Address = 0xe302d5fe (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-Core.dll]
Address = 0xe301cbd2 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-Core.dll]
Address = 0x77719bd1 (filename not found) [in C:\Windows\system32\USER32.dll]
Address = 0x777198da (filename not found) [in C:\Windows\system32\USER32.dll]
Address = 0xe3063f79 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-Core.dll]
Address = 0xe302da4b (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor-Core.dll]
Address = 0x3fdc9421 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor.exe]
Address = 0x3fdbed60 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor.exe]
Address = 0x3fdbedca (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor.exe]
Address = 0x3fdcae1b (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor.exe]
Address = 0x3fdcbae3 (filename not found) [in C:\Program Files\Rocket\Engine\Binaries\Win64\RocketEditor.exe]
Address = 0x7781652d (filename not found) [in C:\Windows\system32\kernel32.dll]
Address = 0x7794c541 (filename not found) [in C:\Windows\SYSTEM32\ntdll.dll]
Address = 0x7794c541 (filename not found) [in C:\Windows\SYSTEM32\ntdll.dll]

It happened sporadically for a blueprint I was making which I have since deleted, therefore I have no instructions for reproducing the bug. It has not happened since. My guess is that it had something to do with the loop in my Blueprint, wherein a “Do N times” node was fed by a custom function.

This is not a real pressing issue, as it has not occurred again.

Hey William,

Thanks for your report! You have provided some good information for helping track down this issue. I’ve logged your information in a defect report and passed it along to our programmers.

Thanks!

-Steve

Hi,

I experience a similar problem. It happens when I open any Blueprint in my project.

Here is the game log.

Thanks.

Some Epic guy will come and say you should create a new thread for this.

Any news on this guys? I’m having the same error messages over here: https://answers.unrealengine.com/questions/335646/error-begin-stack-for-uat-while-cooking.html