Why outputs’ spendable and solvable are false?

I noticed a transaction whose spendable and solvable are both false, what does this mean and why?

 {
    "txid": "c940241a0ef626e865e2004bc120536fb7868d510115e923c76d5e658a97f6d5",
    "vout": 0,
    "address": "mnbFFLXUqTPBweLm6w1GA2ZAJQbrTndEGC",
    "account": "",
    "scriptPubKey": "76a9144d98b2350032c849ac6e6e7ad0eb88e00fd7fbff88ac",
    "amount": 1.10000000,
    "confirmations": 132,
    "spendable": false,
    "solvable": false
},

Is this means this utxo is invalid somehow so cannot spend it?

Also, this is on testnet.

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