ISE8 synthesize error:Failed to open file "STD_INPUT"

[nncore]

hi every body
I have got those two nice messages form iSE8 when i try to synthesize my code:
WARNING:Xst:2359 - "E:/Xilinx/MyWorks/stu/mycomponent.vhd" line 15: Failed to open file "STD_INPUT".
ERROR:Xst:1930 - "E:/Xilinx/MyWorks/stu/mycomponent.vhd" line 17: File <OUTPUT> is already in use.

I can't understand causes.
Can any one help me?:|

 

[nncore]

hi nncore

check if your are using package textio, to eliminate those errors delete read and write routines because they are not synthesisable.

OK

:vroam: