I've been having a lot of trouble working on an app getting this error over and over again. When the error occurs, I can't get into the specfic app at all but I am able to get into others.
Heres what I did:
Tried duplicating the app with QMC and adding it back to stream, the duplicate app works fine.
Soon after, I was continuing to do work on the duplicate app when the error occured again and then I was locked out of the duplicate.
So I decided to go back to the original file and it let me in, once again a few minutes later the internal engine error occurred and I was locked out of the original app. UPDATE AFTER WRITING POST: Although it let me back in to the first app after a short period, I'm now unable to access them AT ALL, it seems waiting does not help.
UPDATE 2 AFTER WRITING POST: I was let back into the original app again, so it seems that this is totally random.
For context, I've been trying to merge two apps into one, one has been edited heavily and the other is brand new, just using the data-auto-load to generate associations between tables.
In this case I have a section in the data load editor to handle "Invoices" (existing app): Table A, Table B, Table C, Table D, Table E (also worth mentioning that these are all left joined into one table during the load)
and another section to handle "Agreements" (new one) : Table A, Table B, Table Z, Table U.
As you can see, they both share Table A and Table B in common. Although, Tables Z and U are unique but contain fields in common with the other tables.
Qlik's automatic way of handling these is by turning 'DuplicateField' into 'TableA.DuplicateField' and 'TableB.DuplicateField'
So in order to remove synthetic keys and have successful data load I've gone through and manually put in 'TableZ.DuplicateField' etc since Qlik would normally make it 'DuplicateField' on Table Z thus creating a loop in the data.
I figured theoretically if I did this for each duplicate field that my problems will be resolved but I can't even test it because I get this internal engine error randomly and then I'm totally locked out of my app for a period of time.
Our Qlik Manager went into the Operations logs to see if there were any records of these errors and he was not able to find any log.
This error has occurred from me trying to load data and even when I just changed the order of the sections in the drag and drop on the data load editor without trying to load it.
Any solutions or ideas?
Please let me know if I am not making sense or articulating my problem clearly, thank you.
UPDATE 3: Despite the error occurring, when I was able to get back into the original app, my changes to the data load editor were kept and I was able to successfully load data with no errors, because of this, I can't even begin to guess what was causing that error, but I now know that it wasn't due to the changes I made in the data load.