Task type 'julia-proc'

I’m trying to use vscode with Julia. I’ve got to running a test program (with or without debugging). It seems to work but I get this message:

Error: there is no registered task type 'julia-proc'. Did you miss installing an extension that provides a corresponding task provider?

Does anyone know what’s up with this? Can it be fixed? Is it to do with falling back on attaching rather than launching?