pacman -Su MSYS2启动失败

pacman -Su
      0 [main] pacman 164 dofork: child -1 - CreateProcessW failed for 'C:\msys64\usr\bin\pacman.exe', errno 13

      0 [main] pacman 172 dofork: child -1 - CreateProcessW failed for 'C:\msys64\usr\bin\pacman.exe', errno 13
                               error: GPGME error: System error w/o errno
error: mingw64: missing required signature
      0 [main] pacman 188 dofork: child -1 - CreateProcessW failed for 'C:\msys64\usr\bin\pacman.exe', errno 13
                               error: database 'mingw64' is not valid (invalid or corrupted database (PGP signature))

这样还不行的话，把所有安全设置和MacType关掉