Reply button does not work

For some reason, reply button in XF 2.3 Beta 6 does not work. This is the output on the console:

Code:

Uncaught ReferenceError: $ is not defined
    at XF.unparseBbCode (lazy-compiled.js?_v=036f9300:1:231)
    at b.click (message.min.js?_v=036f9300:9:52)
    at b._onEvent (core-compiled.js?_v=036f9300:186:278)
    at a (core-compiled.js?_v=036f9300:184:391)
    at HTMLDocument.<anonymous> (core-compiled.js?_v=036f9300:188:156)

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