You need to make a wallet file.
run the wallet program with args 'simplewallet --generate-new-wallet test --password test'
and then run it again with args 'simplewallet --wallet-file test --password test'
You can make the name/pw whatever you want.
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2014-Oct-13 11:19:34.810825 darknetspace wallet v0.6.5.10(0.1-g40b89f0)
2014-Oct-13 11:19:34.810825 Error: you must specify --wallet-file or --generate-new-wallet params
2014-Oct-13 11:19:34.810825 ERROR ..\..\src\simplewallet\simplewallet.cpp:1022[main]Failed to initialize wallet
2014-Oct-13 11:19:44.570838 darknetspace wallet v0.6.5.10(0.1-g40b89f0)
2014-Oct-13 11:19:44.570838 Error: you must specify --wallet-file or --generate-new-wallet params
2014-Oct-13 11:19:44.580838 ERROR ..\..\src\simplewallet\simplewallet.cpp:1022[main]Failed to initialize wallet
2014-Oct-13 11:19:56.960856 darknetspace wallet v0.6.5.10(0.1-g40b89f0)
2014-Oct-13 11:19:56.960856 Error: you must specify --wallet-file or --generate-new-wallet params
2014-Oct-13 11:19:56.960856 ERROR ..\..\src\simplewallet\simplewallet.cpp:1022[main]Failed to initialize wallet
2014-Oct-13 11:22:43.223487 darknetspace wallet v0.6.5.10(0.1-g40b89f0)
2014-Oct-13 11:22:43.233487 Error: you must specify --wallet-file or --generate-new-wallet params
2014-Oct-13 11:22:43.233487 ERROR ..\..\src\simplewallet\simplewallet.cpp:1022[main]Failed to initialize wallet
2014-Oct-13 11:22:44.663489 darknetspace wallet v0.6.5.10(0.1-g40b89f0)
2014-Oct-13 11:22:44.663489 Error: you must specify --wallet-file or --generate-new-wallet params
2014-Oct-13 11:22:44.663489 ERROR ..\..\src\simplewallet\simplewallet.cpp:1022[main]Failed to initialize wallet
2014-Oct-13 11:25:05.923687 darknetspace wallet v0.6.5.10(0.1-g40b89f0)
2014-Oct-13 11:25:05.933687 Error: you must specify --wallet-file or --generate-new-wallet params
2014-Oct-13 11:25:05.933687 ERROR ..\..\src\simplewallet\simplewallet.cpp:1022[main]Failed to initialize wallet
2014-Oct-13 11:29:36.952103 darknetspace wallet v0.6.5.10(0.1-g40b89f0)
2014-Oct-13 11:29:36.952103 Error: you must specify --wallet-file or --generate-new-wallet params
2014-Oct-13 11:29:36.962103 ERROR ..\..\src\simplewallet\simplewallet.cpp:1022[main]Failed to initialize wallet
2014-Oct-13 04:17:16.246532 Binding on 127.0.0.1:37709
2014-Oct-13 04:17:16.247533 Core rpc server initialized OK on port: 37709