Lispworks MacOS Cocoa + NIL 0 error
I have several students with this problem on Lispworks Personal, MacOS.
Fresh install. Start Lispworks. File | New. A dialog appears about an error in the Cocoa Event Loop, "In + of (NIL 0) arguments should be of type NUMBER.
Near the top of the backtrace
Any ideas?Call to SYSTEM::ARGS-TO-BINARY-ARITHMETIC-FN-NOT-OF-TYPE {offset 139} SYSTEM::FN-NAME : + SYSTEM::ARG1 : NIL SYSTEM::ARG2 : 0 TYPE {Closing} : NUMBER Call to CAPI-INTERNALS:LAYOUT-DIVIDER-PERFORM-MOVE {offset 414} CAPI::SELF : #<CAPI-INTERNALS:COLUMN-LAYOUT-DIVIDER 229CE76B> CAPI::DX : 0 CAPI::DY : 4.5
-- ................................................. Christopher Riesbeck Associate Professor, Electrical Engineering and Computer Science McCormick School of Engineering Northwestern University 2145 Sheridan Rd., Evanston, IL 60208 Home page: http://www.cs.northwestern.edu/~riesbeck/ Calendar: http://www.cs.northwestern.edu/~riesbeck/calendar.html