solve_QT_Creator_errors

Android build sdk not defined

I found a strange solution:

closed qtcreator

I edited the *pro.user file of my project.
there are some entries::
<value type="QString" key="BuildTargetSdk"></value>
<value type="QString" key="KeystoreLocation"></value>

3: I changed every occurence of
<value type="QString" key="BuildTargetSdk"></value>
to
<value type="QString" key="BuildTargetSdk">android-26</value>

(26 is my android sdk tools main version)

4: Now I can deploy again to my smartphone.

Strange is: the combobox "Android build Sdk" still is empty... doesn't matter now...

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QT "Could not determine java version from 10" or 9:

Install Java NDK 8 and gets solved

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"Unable to fetch developer disk image path"

find your Xcode APP
right-click on the APP to get the content
open Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport
duplicate your 11.3 (...) or so folder
rename duplicated folder to 11.3