Selecting 'Compile' from the quickstart menu, the following error occurs: "Command txs:///compile not defined".
However, choosing 'Tools | Command| LuaLatex from the menus, starts the compile process which runs normally.
Similarly when 'View' is selected the following error occurs: "Command txs:///view not defined".
I have reinstalled TexStudio 12.12.4 with no success.
I installed TexStudio 12.12.2 which runs with no problems, compiling and displaying the same files files in an external pdf reader.
I have tried copying the contents of the build section of preferences in texstudio.ini 12.12.2 to 12.12.4 with no success.
I would appreciate any advice - thanks.