lazarus trunk building error lazarus / 21-General ---------------------------------------------------------------------- fcu · 2024-04-02 06:08 Hi i've download lazarus main branch yesterday , then i tried building it using ( make all ) , it works fine but after i lanch lazarus i tried building it using  Menu -> Tools ->Build lazarus with profile : optimized IDE  then i got this error : Fatal: Can't find unit laz.VTIDEEditors used by laz.RegisterVirtualTreeView system : windows 32bits / fpc 3.3.1 btw i checked the unit laz.VTIDEEditors and its exist in lazarus\components\virtualtreeview ---------------------------------------------------------------------- JuhaManninen · 2024-04-02 08:09 I don't know what exactly happened but usually a clean build helps. Tools -> Configure "Build Lazarus" ... There check the "Clean all" and then Build. ---------------------------------------------------------------------- TRon · 2024-04-02 08:53 Seems to be a known issues. see 40701. PS: Also see this thread.