ALTCLKCTRL error

Hi All,

in my current project i used a ALTCLKCTRL block with 2 inputs. 1 from the PLL(125MHz) and the other 1 from an external pin.

the clkselect is a switch from another block.

The same blocks i used in another design, and it worked perfectly!

in this design, when i connect the output of the block to a virtial pin, i got the error: Error: inclk[1] port of Clock Control Block "node" cannot be used when clkselect port is not used or is a constant.

If i disconnect the Virtial pin, i dont get an error.

I tried to connect to 5 different points, and half of them work.

How can i solve this problem?

Thanks in advance!

regards

Bram