@roo_ said in beginner error trying to deploy project: _ZNSt18condition_variable4waitERSt1unique_lockStmutexE could not be located in the dynamic link library path QT5Core.dll. Often, this means you accidentally deployed the MSVC version instead of the MinGW version of Qt5Core.dll. The recommended way to deploy is to use windeployqt. If you want to deploy manually, make sure you copy the correct DLLs (do not take any DLLs from the Qt Creator folder!) See http://wiki.qt.io/Deploy_an_Application_on_Windows for details.

I had checked the toolchain with my previous installation which is gone with the crash of my desktop. Therefore, I cannot check anymore. However, the toolchain for cross-compilation on my current installation is broken.