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BLE_ERROR_GATTS_SYS_ATTR_MISSING from sd_ble_gatts_hvx

Hello,

I am trying to send out a notification and getting this error code 13313 (in decimal, 0x3401 in hex). Which eventually leads to BLE_ERROR_GATTS_SYS_ATTR_MISSING. What system attribute am I missing here?

Thank you.

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