Will not compile: Proc CHANGE[M] (0.9.2.4)

Example: Help_30, line 115 If M and Mouse Key=1 Then Proc CHANGE[M] ...causes the following error: main.aoz:115:33: error: message not found crash_error:(pass: 1

cannot read property 'charat' of undefined

typeerror: cannot read property 'charat' of undefined...