恐慌：运行时错误：运行Blockchainr时无效的内存地址或零指针取消引用

Question

我运行blockchainr并获得以下终端输出：

17:39:57 2015-06-16 [INF] loading db leveldb

panic: runtime error: invalid memory address or nil pointer dereference

    panic: runtime error: invalid memory address or nil pointer dereference

[signal 0xb code=0x1 addr=0x0 pc=0x402cb63]

goroutine 1 [running]:

main.search(0x4911ef8, 0xc20806e2d0, 0x0, 0x0, 0x4911ef8)

    /Users/mesquka/Downloads/blockchainr-master/src/blockchainr/main.go:185 +0x3fa

main.main()

    /Users/mesquka/Downloads/blockchainr-master/src/blockchainr/main.go:284 +0x3ce

goroutine 5 [semacquire]:

sync.(*Cond).Wait(0xc208045100)

    /usr/local/go/src/sync/cond.go:62 +0x9e

github.com/conformal/seelog.(*asyncLoopLogger).processItem(0xc20802c4e0, 0x0)

    /Users/mesquka/Downloads/blockchainr-master/src/github.com/conformal/seelog/behavior_asynclooplogger.go:50 +0xc2

github.com/conformal/seelog.(*asyncLoopLogger).processQueue(0xc20802c4e0)

    /Users/mesquka/Downloads/blockchainr-master/src/github.com/conformal/seelog/behavior_asynclooplogger.go:63 +0x31

created by github.com/conformal/seelog.newAsyncLoopLogger

    /Users/mesquka/Downloads/blockchainr-master/src/github.com/conformal/seelog/behavior_asynclooplogger.go:40 +0x8e

代码位于https://github.com/FiloSottile/blockchainr

我运行的特定命令（按顺序）是：

使所有

./bin/btcd --datadir=~/Btcd/

./bin/blockchainr -datadir ~/Btcd/

最后一个命令是我得到这个终端输出的地方。

Answer 1

您的问题在于Blockchainr main.go以下几行：var (    dataDir = flag.String("datadir", filepath.Join(btcutil.AppDataDir("btcd", false), "data"), "BTCD: Data directory")    dbType  = flag.String("dbtype", "leveldb", "BTCD: Database backend"))如您所见，如果您不指定dbtype默认标志，则"leveldb"它希望datadir参数包含 LevelDB 数据库的路径。