open3: Can't call method "close" on an undefined value at C:/perl/lib/IPC/Open3.pm line 368.

open3: Can't call method "close" on an undefined value at C:/perl/lib/IPC/Open3.pm line 368.

    while executing
"::perl::CODE(0x18627b4)"
    invoked from within
".b invoke "
    invoked from within
".b instate {pressed !disabled} { .b state !pressed; .b invoke } "
    (command bound to event)