Composers Desktop Project Forum

Hi all,
I am very new on CDP, I just installed it and seems to works fine but when I run some operation it give me this error:

can't read "chlist": no such variable
can't read "chlist": no such variable
    while executing
"llength $chlist"
    (procedure "GetParamsAndRunProgram" line 178)
    invoked from within
"GetParamsAndRunProgram"
    (procedure "GotoProgram" line 101)
    invoked from within
"GotoProgram                   "
    (procedure "Dlg_Process_and_Ins_Menus" line 445)
    invoked from within
"Dlg_Process_and_Ins_Menus"
    (procedure "GotoGetAProcess" line 207)
    invoked from within
"GotoGetAProcess                        "
    ("1" arm line 10)
    invoked from within
"switch -regexp -- $pr_ins  $evv(INS_COMPLETED) -    $evv(INS_ABORTED)    {}    $evv(INS_CONTINUES) {                     ;#   Instrument sets out to run process
            set ins..."
    (procedure "CreateIns" line 163)
    invoked from within
"CreateIns"
    invoked from within
".workspace.1.a.top.machcr invoke"
    ("uplevel" body line 1)
    invoked from within
"uplevel #0 [list $w invoke]"
    (procedure "tk::ButtonUp" line 23)
    invoked from within
"tk::ButtonUp .workspace.1.a.top.machcr"
    (command bound to event)

I am on El Capitan 10.11.5 and CDP 7.1.0

does someone knows how to fix this error?
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