I used the wallet to mine without a pool and my wallet is fully synced
I foollowed the steps in SOLO MINING
https://kratom.pw/mining/12:49:07

{
"blocks" : 949932,
"currentblocksize" : 1000,
"currentblocktx" : 0,
"difficulty" : 53.20900848,
"errors" : "",
"generate" : true,
"genproclimit" : -1,
"hashespersec" : 2603,
"networkhashps" : 3187729121,
"pooledtx" : 0,
"testnet" : false
}
Too many people mining for solo mining to work on regular computers. Says that on that page. You need to join one of the pools.