Please refer to your charger user manual: but in general, this indicates that the charger has determined that one or more of your rechargeable is faulty (despite the fact that it may still hold a partial charge).
Smart charger can measure the expected voltage and current flow and will prevent any 'faulty' cells to be charged (those 'faulty' rechargeable batteries may actually still be useful and charged on other less intelligent charger). Try charging them individually (if your charger can handle individual battery) or in different pair combination to locate flaw cell.
Hope it helps.
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