Check the log files for errors. If you have imported the apps from another Qlik Sense Server the required data connections are unfortunately not imported together with the qvf-file. That is probably why the tasks fail since the data connections are missing. Check in QMC > Data Conenctions if they are there and if they are properly set up.
” When you import an app developed on Qlik Sense Desktop, existing data connections are imported to the QMC. When you export an app from a server, existing data connections are not exported with the app.”
Since the QAP is a Qlik Sense-server without the "hub" and aimed for integration purposes only you have to find a way to import the data connections into the QAP QMC for reloads to work. One way could be to create an empty app in Qlik Sense Desktop with the required data connections and then import this qvf into the QAP. Then you can manage and set up the imported data connections properly in the QAP QMC.
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Sense desktop is not allowed to be installed in Windows server where Sense server is installed, so if I want to export apps from Sense server to QAP and refresh them in QAP, how can I do that? As Jim has mentioned, the connections are not coming with apps so they do not exist in the QAP, causing reload task failed.
I had the same problem earlier: no QS desktop on the server and thus cannot import data connections at all.I solved this by applying the QSE license in the server first, created an app with all data connections I would need later in QAP, I then switched back to QAP license as soon as all the data connections I need are created and tested. I then replaced all the data connections in the data load of the QSE apps before they get imported to QAP.
Example of commenting QSE data connection and switching to QAP data connection in the data load prior to exporting the app: