cyclone II differential IO error

[Altera_Forum]

Hi, 

 I have an LVDS transmitter and LVDS receiver in my design and i am getting below error when i do systhesis.  "Input port DIFFERENTIALIN can only connect to output port DIFFERENTIALOUT of another IO atom"  I have also attached the file in which it is giving this error.  Thanks,

[Altera_Forum]

--- Quote Start ---  Hi,  I have an LVDS transmitter and LVDS receiver in my design and i am getting below error when i do systhesis.  "Input port DIFFERENTIALIN can only connect to output port DIFFERENTIALOUT of another IO atom"  I have also attached the file in which it is giving this error.  Thanks,  --- Quote End ---   Goto Assigment -> Pin planner. Select that you signal is LVDS. Connect positive and negative signals to pins.

[Altera_Forum]

The solution you suggested does not work, still i am getting sythesis error.

[Altera_Forum]

ARTEM, 

 one more thing when i chane the device to cyclone III and do sythesis then it does not give any error even if i do not assign pin for LVDS signals.  Is it some issue with ALTLVDS of cyclone ii?  regards,