Pop-up Window Example "ERROR: Non Boolean in test."

[mmmstream]

When running the "Pop-up Window" example code here https://tidalcycles.org/docs/reference/cycles, for me all that happens is these warnings spam the post window and only the clockText shows up as the GUI.

ERROR: Non Boolean in test.
RECEIVER:
nil
PROTECTED CALL STACK:
Meta_MethodError:new 0x55e81db3a640
arg this = MustBeBooleanError
arg what = nil
arg receiver = nil
Object:mustBeBoolean 0x55e81d5dd9c0
arg this = nil
DirtSoundLibrary:getEvent 0x55e81e5cefc0
arg this = a DirtSoundLibrary
arg name = tick
arg index = none
var allEvents = nil
var event = ( 'instrument': tick, 'hash': 1325211871 )
DirtEvent:mergeSoundEvent 0x55e81daef800
arg this = a DirtEvent
var soundEvent = nil
a FunctionDef 0x55e81daeed00
sourceCode = ""
a FunctionDef 0x55e81e9e5000
sourceCode = ""
Function:prTry 0x55e81ddc5440
arg this = a Function
var result = nil
var thread = a Thread
var next = nil
var wasInProtectedFunc = false

CALL STACK:
MethodError:reportError
arg this =
Nil:handleError
arg this = nil
arg error =
Thread:handleError
arg this =
arg error =
Object:throw
arg this =
Function:protect
arg this =
arg handler =
var result =
Environment:use
arg this =
arg function =
var result = nil
var saveEnvir =
DirtEvent:play
arg this =
OSCFuncRecvPortMessageMatcher:value
arg this =
arg msg = [*9]
arg time = 2174.32897954
arg addr =
arg testRecvPort = 57120
OSCMessageDispatcher:value
arg this =
arg msg = [*9]
arg time = 2174.32897954
arg addr =
arg recvPort = 57120
Main:recvOSCmessage
arg this =
arg time = 2174.32897954
arg replyAddr =
arg recvPort = 57120
arg msg = [*9]
^^ The preceding error dump is for ERROR: Non Boolean in test.
RECEIVER: nil

[jqueraltmo]

I've just tested this example and it worked well.

It's been a long time since @mmmstream reported this, and it doesn't seem to be a problem with the documentation itself, but I'll leave this open for a while in case someone can reproduce this error or give some more information.