Why is the "replace spine" option greyed out?

[Xolia Hyacinth]

 

I tried to find solutions as to why my "replace spine" option is greyed out but with no luck I do not have a single idea as to why this is happening. All I have done is used pen tool to trace a picture and used the blending tool (specified steps 1000). Any help is very appreciated!

 

 

[Monika Gause · Accepted solution]

You need to select the path you want to use as a spine and the existing blend. And then the command is active.

[Xolia Hyacinth]

It still does not let me 

[Xolia Hyacinth]

Wait nevermind, I solved it; I think I was not suppose to group it together. Instead I was suppose to click on each individual path or use direct selection and the blended object. The replace spine should then be active. For those who had the same problem as me, click on one object (the pen tool drawn object) then one blended stick/object by using the shift command. 

[Jobin5E7E]

Thank you so much, nothing worked until I found this

[Lauretta34461843423q]

Gosh! Even this is still not working for me.  Unless I am doing something terribly wrong. Anyone with another solution? 

[Monika Gause]

The spine needs to be one (!) open path.

[Lauretta34461843423q]

Right! Thank you! solved now

[Ruxandra34473882y0x4]

Hello! I need a little help, please. Do you have any idea why it's not working for me? I have checked all of the above and the replice spine button is still greyed out.

[Monika Gause]

Can you please show these objects in the layers panel?

You need to click on the little arrow to the left of the layer to open it.

[Natalia22546272x8tc · Accepted solution]

I had similar problem, make sure that spine that you want to replace with is not a group (press ungroup) nor compound path (press release if so). 

[Fjd26]

This comment helped so much. Thank you for commenting!