# Unable to loft **URL:** \ **Category:** Packages\ **Created:** [March 26, 2015, 10:13am UTC](https://forum.dynamobim.com/t/unable-to-loft/1247 "2015-03-26T10:13:23Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![Marques](https://avatars.discourse-cdn.com/v4/letter/m/6bbea6/32.png) [@Marques](https://forum.dynamobim.com/u/Marques)\ **Post date:** [March 26, 2015, 10:13am UTC](https://forum.dynamobim.com/t/unable-to-loft/1247/1 "2015-03-26T10:13:23Z")
![unable_to_loft](https://cdck-file-uploads-us1.s3.dualstack.us-west-2.amazonaws.com/flex022/uploads/dynamobim/original/2X/2/25a6bbad09a90d48e9ed34d0fc6d5bdad165bd26.png)             Hi! I’ve been trying to made a loft between two sections and so far i can’t. Can anyone please indicate me a workaround? Thanks!   Error : Warning: Solid.ByLoft operation failed. Unable to loft! : BAD\_UV\_SKIN\_DIR – Surface U and V derivatives are in the same or opposite direction ---
**Author:** ![Dimitar\_Venkov](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/dimitar_venkov/32/2068_2.png) [@Dimitar\_Venkov](https://forum.dynamobim.com/u/Dimitar_Venkov)\ **Post date:** [March 26, 2015, 8:57pm UTC](https://forum.dynamobim.com/t/unable-to-loft/1247/2 "2015-03-26T20:57:09Z")
Hi Marques, What method did you use to generate your curves? ![2015-03-27_101633](https://cdck-file-uploads-us1.s3.dualstack.us-west-2.amazonaws.com/flex022/uploads/dynamobim/original/1X/30173b0260da94ffd7dcb4e88cef51daeddcf75e.jpg)   ---
**Author:** ![Marques](https://avatars.discourse-cdn.com/v4/letter/m/6bbea6/32.png) [@Marques](https://forum.dynamobim.com/u/Marques)\ **Post date:** [March 27, 2015, 5:04am UTC](https://forum.dynamobim.com/t/unable-to-loft/1247/3 "2015-03-27T05:04:03Z")
Problem solved, thanks 😉 ---
**Author:** ![Paul\_Wintour](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/paul_wintour/32/9381_2.png) [@Paul\_Wintour](https://forum.dynamobim.com/u/Paul_Wintour)\ **Post date:** [November 2, 2015, 1:26am UTC](https://forum.dynamobim.com/t/unable-to-loft/1247/4 "2015-11-02T01:26:20Z")
Hi I am having similar problems. I’m using Rhynamo to import the outline geometry. The polycurves are all pointing in the same direction, closed, etc but I am getting the same error: **Error : Warning: Solid.ByLoft operation failed.** **Unable to loft! : BAD\_UV\_SKIN\_DIR — Surface U and V derivatives are in the same or opposite direction**   I’ve rebuilt the polycurve by extracting each sub curve, getting its start point and then creating a new polycurve by points by the problem persists. Any suggestions?   ![Dynamo issue](https://cdck-file-uploads-us1.s3.dualstack.us-west-2.amazonaws.com/flex022/uploads/dynamobim/original/2X/0/01d4e5fc48f575b48d799a81f1dfc413aa48cefe.jpg) ---
**Author:** ![saju\_autodesk](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/saju_autodesk/32/61838_2.png) [@saju\_autodesk](https://forum.dynamobim.com/u/saju_autodesk)\ **Post date:** [July 26, 2018, 6:21am UTC](https://forum.dynamobim.com/t/unable-to-loft/1247/5 "2018-07-26T06:21:28Z")
I am facing the same issue now . how did you manage to do at the end? were you successful? ---
**Author:** ![Paul\_Wintour](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/paul_wintour/32/9381_2.png) [@Paul\_Wintour](https://forum.dynamobim.com/u/Paul_Wintour)\ **Post date:** [July 27, 2018, 12:12am UTC](https://forum.dynamobim.com/t/unable-to-loft/1247/6 "2018-07-27T00:12:27Z")
sorry its been so long now I don’t remember. ---
**Author:** ![Howie](https://avatars.discourse-cdn.com/v4/letter/h/9fc29f/32.png) [@Howie](https://forum.dynamobim.com/u/Howie)\ **Post date:** [December 30, 2020, 8:09am UTC](https://forum.dynamobim.com/t/unable-to-loft/1247/7 "2020-12-30T08:09:03Z")
Facing the same error now. Does anyone have suggestions? ---
**Author:** ![danail.momchilov](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/danail.momchilov/32/152056_2.png) [@danail.momchilov](https://forum.dynamobim.com/u/danail.momchilov)\ **Post date:** [March 21, 2022, 8:58am UTC](https://forum.dynamobim.com/t/unable-to-loft/1247/8 "2022-03-21T08:58:43Z")
Same here ☹ ![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/d/7/d764bc3ac7e2237cf84d999e386271af52f8f513.png) ---
**Author:** ![solamour](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/solamour/32/153516_2.png) [@solamour](https://forum.dynamobim.com/u/solamour)\ **Post date:** [March 21, 2022, 5:18pm UTC](https://forum.dynamobim.com/t/unable-to-loft/1247/9 "2022-03-21T17:18:10Z")
@Aparajit_Pratap is it possible to shed some light on what this error message means for people in this thread 🙂 ? ---
**Author:** ![Aparajit\_Pratap](https://avatars.discourse-cdn.com/v4/letter/a/f07891/32.png) [@Aparajit\_Pratap](https://forum.dynamobim.com/u/Aparajit_Pratap)\ **Post date:** [March 21, 2022, 6:20pm UTC](https://forum.dynamobim.com/t/unable-to-loft/1247/10 "2022-03-21T18:20:15Z")
@danail.momchilov can you share the graph for us to take a look at exactly what is failing and why? ---
**Author:** ![gkhalifah](https://avatars.discourse-cdn.com/v4/letter/g/958977/32.png) [@gkhalifah](https://forum.dynamobim.com/u/gkhalifah)\ **Post date:** [November 28, 2023, 10:51am UTC](https://forum.dynamobim.com/t/unable-to-loft/1247/11 "2023-11-28T10:51:35Z")
hi Paul, did you solve the problem? ---
**Author:** ![denes.nagy](https://avatars.discourse-cdn.com/v4/letter/d/8e8cbc/32.png) [@denes.nagy](https://forum.dynamobim.com/u/denes.nagy)\ **Post date:** [August 29, 2024, 6:15am UTC](https://forum.dynamobim.com/t/unable-to-loft/1247/12 "2024-08-29T06:15:51Z")
Hi, I met with the same error message yesterday. After reading some other posts, I found there a solution for my problem. I put a List.Transpose node right before the Surface.ByLoft node and now it works well.