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inconsistent tangent and guide constraints


swdweeb

I am trying to blend the space between two surfaces and I am also trying to use "select guides" to influence the blend.  I'm trying to model a diamond. The bottom shape is a heptagon (six sided in case you're like me an had to look it up) the top shape is a circle.

45l7WWDSmjdG9bATIyyDBQ.png

After selecting the surfaces and the blend tool I get the expected "wavey" shape.

0UT1w6kc6AXkScAE1TpneA.png

I then select the guide tool and start to select guide lines. 

58s3syfbFbjYgWC51Sw6jg.png

Sometimes I can select multiple lines before it simply clears the blend and throws the "Inconsistent tangent and guide constraints" error, sometimes it will throw it as soon as I click the first guide.

1sxMBxUlrqXzWGJVJON7qg.png

Can anyone tell me what this error is trying to tell me and I guess along those same lines, what I can do to make this work consistently?

Happy to share the rsdoc with anyone if that would help.

Thanks in advance.