topic Re: "Constraint Error When Placing Couplers Between Rebars in Revit API" in Revit Structure Forum

"Constraint Error When Placing Couplers Between Rebars in Revit API"

veeresh.huvinahalliACK3L — Mon, 14 Oct 2024 14:11:26 GMT

"I'm encountering a constraint error while using the Revit API to join rebars with couplers. I have three rebars of the same diameter, and they are lapped. I can successfully place a coupler between the first two rebars, but when trying to place a coupler between the second and third, I receive a constraint error.

The first two rebars are hosted by different elements, while the second and third share the same host. I’ve attempted to change the host to resolve the issue, but it hasn't worked. Could you please help me understand why this error occurs and how to fix it? I’ve attached a document and video for further details."

Re: "Constraint Error When Placing Couplers Between Rebars in Revit API"

apjones — Mon, 14 Oct 2024 14:57:48 GMT

If the bars are correctly aligned, it will work. (Tested in Revit 2024)

(confirmed in Revit 2023 also)

Did you mean for the first bar to be "kinked" like this?

Re: "Constraint Error When Placing Couplers Between Rebars in Revit API"

jay_colc — Mon, 14 Oct 2024 15:47:00 GMT

I did not get the warning you got but I received this warning instead using Revit 2025

I then used the Align Tool and Aligned them both in Elevation and it worked without error but the strange thig is i had it use the Align Tool twice on the same elements for it to move?

(view in My Videos)