Remove unused occasions from capthist

I am getting the following error when trying to fit a mask to my capthist. I think I need to remove the unused occasions but how do I do this?

Checking data
Session 1
Errors in traps
Occasions when no detectors 'used'
2 3 4 5 6 7 8 9 10 11 12 13 14 16 18 19 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 47 48 50 51 56 59 112 113 122 130 131 147 154 157 158 162 167 168 169 171 172 174 175
Error in secr.fit(ocelot_capthist, mask = mask_1, model = list(D ~ 1, :
'verify' found errors in 'capthist' argument

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