# ClosedPath AssertionError
**URL:** https://discourse.julialang.org/t/closedpath-assertionerror/74671
**Category:** New to Julia
**Tags:** error-message
**Created:** [January 15, 2022, 3:01pm UTC](https://discourse.julialang.org/t/closedpath-assertionerror/74671 "2022-01-15T15:01:16Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@fadil](https://discourse.julialang.org/u/fadil)
#### Post date: [January 15, 2022, 3:01pm UTC](https://discourse.julialang.org/t/closedpath-assertionerror/74671/1 "2022-01-15T15:01:16Z")
I get the problem when trying to create interior of the ClosedPath.
z1 = 0 + 0im; z2 = 3 + 1im; z3 = 2 + 2im; z4 = 1 + 3im;
p = ClosedPath([Segment(z1, z2), Segment(z2, z3), Segment(z3, z4), Segment(z4, z1)])
interior(p)
I get the following error:
ERROR: AssertionError: Curve endpoints do not match for pieces 1 and 2
Why? How to solve the problem?
---
### Author:  [@rafael.guerra](https://discourse.julialang.org/u/rafael.guerra)
#### Post date: [January 15, 2022, 4:02pm UTC](https://discourse.julialang.org/t/closedpath-assertionerror/74671/2 "2022-01-15T16:02:05Z")
You should indicate the package you are using. If it is `ComplexRegions`, then there could be a bug related to numerical checks around point `z1 = 0 + 0 im`.
Changing `z1` to a small number seems to fix the problem, for ex: `z1 = 1e-3 + 0im`. Perhaps you could open an issue in github.
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### Author:  [@fadil](https://discourse.julialang.org/u/fadil)
#### Post date: [January 15, 2022, 4:38pm UTC](https://discourse.julialang.org/t/closedpath-assertionerror/74671/3 "2022-01-15T16:38:27Z")
Yes, z1 = 1e-3+ 0im is the solution!!!
I am so thankfull, thanks, thanks, thanks!!!💓💓💓💓
Regards from Fadil Galjic