Lexical decision with yoked pair stimuli

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Thank you!
I have tried doing that, and I am not sure what I've done wrong, as it isn't working. There are no reported issues with the code, but when I run the study no catch-trials appear. I have the following block (and 3 others like it) defined in the procedure with catch trials. Am I defining it in the wrong place?

  {
"lexdec_blockA1": {
      "trial_templates": ["primes_templateA1","targets_templateA1"],
      "pattern": {"order": "alternate_random", "repeat": 1} ,
      "catch_trials":[{"template":"Break", "frequency":10}]
}