WinDivert passthru example returns "warning: failed to reinject packet (1237)"

WinDivert passthru example returns "warning: failed to reinject packet
(1237)"

I am running Windows 7 Ultimate with SP1. I downloaded the
WinDivert-1.0.5-MSVC package and ran the passthru.exe file with command
"E:\lib\WinDivert-1.0.5-MSVC\x86>passthru.exe true 1". Then it gave me the
error: "warning: failed to reinject packet (1237)". And the network got
broken, too. Can anybody tell me why? Thx.
E:\lib\WinDivert-1.0.5-MSVC\x86>passthru.exe "true" 1
warning: failed to reinject packet (1237)
warning: failed to reinject packet (1237)
warning: failed to reinject packet (1237)
warning: failed to reinject packet (1237)
warning: failed to reinject packet (1237)
warning: failed to reinject packet (1237)
warning: failed to reinject packet (1237)
warning: failed to reinject packet (1237)
warning: failed to reinject packet (1237)
warning: failed to reinject packet (1237)
^C
E:\lib\WinDivert-1.0.5-MSVC\x86>