Since 26 June 2019 Lauterbach implemented a new screen driver model to support different GUI frameworks. The GUI specific software parts were split out into shared libraries (t32screen*).

If one of the following shared object files  

• t32screencde.so (for UNIX)
•  t32screenqt4.so (for UNIX)  
•  t32screenqt5.so (for UNIX)
• t32screenwin.dll (for Windows)

or a related shared library is missing, detailed troubleshooting and background information can be found under https://www.lauterbach.com/3737