good good study, day day up

I use COL-1.5.1-release, after I have sync, I get the info :
WARNING: Checkpoint is too old. Wait for block chain to download, or notify developers.

then I input getmininginfo in console, get like this:

{
"blocks" : 256568,
"currentblocksize" : 1000,
"currentblocktx" : 0,
"difficulty" : 0.17436570,
"errors" : "WARNING: Checkpoint is too old. Wait for block chain to download, or notify developers.",
"generate" : false,
"genproclimit" : -1,
"hashespersec" : 0,
"networkhashps" : 29737722,
"pooledtx" : 0,
"testnet" : false
}

could anyone tell me what's the matter???

同收，有的带价PM

我的钱包地址：BBaxoToJZzMneZYnv3KEiJHtx4hjePHjh2
谢谢！祝BBL前途似锦。