IOTA Light Wallet returns Request Error when sending funds

I am running IOTA Light Wallet 2.5.4 and am connected to my own full node that is in-sync with 4 healthy tangle connections. The minimum weight magnitude (MWM) is set to 14.

When attempting to send funds from the wallet the UI displays Sending... for several minutes, and eventually turns red saying Request Error.

This is the server log at the time of the transaction:

11/30 05:15:00.049 [XNIO-1 task-8] INFO  com.iota.iri.service.TipsManager - Reason to stop: belowMaxDepth
11/30 05:15:00.049 [XNIO-1 task-8] INFO  com.iota.iri.service.TipsManager - Tx traversed to find tip: 20
11/30 05:15:00.613 [XNIO-1 task-8] INFO  com.iota.iri.service.TipsManager - Reason to stop: belowMaxDepth
11/30 05:15:00.613 [XNIO-1 task-8] INFO  com.iota.iri.service.TipsManager - Tx traversed to find tip: 11
11/30 05:15:01.328 [XNIO-1 task-8] INFO  com.iota.iri.service.TipsManager - Reason to stop: TransactionViewModel is a tip
11/30 05:15:01.328 [XNIO-1 task-8] INFO  com.iota.iri.service.TipsManager - Tx traversed to find tip: 6
11/30 05:15:01.478 [XNIO-1 task-8] INFO  com.iota.iri.service.TipsManager - Reason to stop: belowMaxDepth
11/30 05:15:01.478 [XNIO-1 task-8] INFO  com.iota.iri.service.TipsManager - Tx traversed to find tip: 3
11/30 05:15:01.881 [XNIO-1 task-8] INFO  com.iota.iri.service.TipsManager - Reason to stop: TransactionViewModel is a tip
11/30 05:15:01.881 [XNIO-1 task-8] INFO  com.iota.iri.service.TipsManager - Tx traversed to find tip: 6
11/30 05:15:02.641 [XNIO-1 task-8] INFO  com.iota.iri.service.TipsManager - Reason to stop: belowMaxDepth
11/30 05:15:02.641 [XNIO-1 task-8] INFO  com.iota.iri.service.TipsManager - Tx traversed to find tip: 6
11/30 05:15:04.111 [XNIO-1 task-8] INFO  com.iota.iri.service.TipsManager - Reason to stop: belowMaxDepth
11/30 05:15:04.111 [XNIO-1 task-8] INFO  com.iota.iri.service.TipsManager - Tx traversed to find tip: 9
11/30 05:15:04.280 [pool-2-thread-2] INFO  com.iota.iri.network.Node - toProcess = 0 , toBroadcast = 0 , toRequest = 1 , toReply = 0 / totalTransactions = 3296908
11/30 05:15:04.334 [XNIO-1 task-8] INFO  com.iota.iri.service.TipsManager - Reason to stop: belowMaxDepth
11/30 05:15:04.334 [XNIO-1 task-8] INFO  com.iota.iri.service.TipsManager - Tx traversed to find tip: 30
11/30 05:15:04.838 [XNIO-1 task-8] INFO  com.iota.iri.service.TipsManager - Reason to stop: TransactionViewModel is a tip
11/30 05:15:04.838 [XNIO-1 task-8] INFO  com.iota.iri.service.TipsManager - Tx traversed to find tip: 23
11/30 05:15:05.492 [XNIO-1 task-8] INFO  com.iota.iri.service.TipsManager - Reason to stop: TransactionViewModel is a tip
11/30 05:15:05.493 [XNIO-1 task-8] INFO  com.iota.iri.service.TipsManager - Tx traversed to find tip: 25

Why can I not use this node to run transactions?