Description:

After installation then i try to add something on a patch a function or a class, a get this error:

```om-console
OM > "ERROR: No applicable methods for #<standard-generic-function panel 40E0F978E4> with args (nil)

Call to om-lisp::om-error-handler
Call to invoke-debugger
Call to error
Call to cerror
Call to (method no-applicable-method (t))
Call to clos::generic-function-non-discriminator
Call to clos::apply-no-applicable-method
Call to add-box-from-menu
Call to capi::internal-funcall-using-callback-type
Call to capi::execute-callback
Call to capi::execute-callback-1
Call to capi:execute-with-interface
Call to (method capi-library:representation-popup-menu (capi-gtk-library::screen-representation t t t t t t))
Call to capi:display-popup-menu
Call to (method om-api::om-context-menu-callback (om-graphic-object t t))
Call to capi::in-process-capi-event-callback
Call to capi-gtk-library::output-pane-button-event-wrapper
Call to capi-gtk-library::output-pane-button-press-event-wrapper
Call to (method mp:general-handle-event (capi::execute-with-interface-event))
Call to capi-internals:loop-process-events
Call to capi::interface-event-loop
Call to capi::initialize-and-process-events
Call to (method capi-library:interface-process-wrapper (capi-gtk-library::gtk-representation t t))
Call to mp::process-sg-function
"
```


Additional info:

package version(s): openmusic-bin 6.17-1

Steps to reproduce:

open `openmusic` & create_patch & right click & add x_class|x_function = error.

I tried to change PKGBUILD with the new version, but it changed nothing for this issue.