# Why cant I place detail component by curve?
**URL:** https://forum.dynamobim.com/t/why-cant-i-place-detail-component-by-curve/41252
**Category:** Uncategorized
**Created:** [September 30, 2019, 9:31am UTC](https://forum.dynamobim.com/t/why-cant-i-place-detail-component-by-curve/41252 "2019-09-30T09:31:20Z")
**Posts on this page:** 5
**Page:** 2
### Author:  [@bao1296](https://forum.dynamobim.com/u/bao1296)
#### Post date: [October 2, 2019, 5:46pm UTC](https://forum.dynamobim.com/t/why-cant-i-place-detail-component-by-curve/41252/21 "2019-10-02T17:46:07Z")
I am developing this file, but I have 2 unsolved questions.
1. I want to divide 2 type rebar shape, with M\_01, I will use family 90 degree, with M\_01 I will use family 180 degree, but When I try with this file, It cant convert list rebar shape to list family type (as node List.create )
2. Why I choose 2 rebar and I create list with 2 value Family type, I cant finish file dynamo (Warning: Internal error, please report: Dereferencing a non-pointer.)
---
### Author:  [@rinag](https://forum.dynamobim.com/u/rinag)
#### Post date: [October 26, 2019, 8:27am UTC](https://forum.dynamobim.com/t/why-cant-i-place-detail-component-by-curve/41252/22 "2019-10-26T08:27:46Z")
Hi,
I’m following ur instruction but i got this error in python script :
“Warning: IronPythonEvaluator.EvaluateIronPythonScript operation failed.
Traceback (most recent call last):
File “”, line 32, in
ImportError: No module named traceback”
any idea how to fix it?
---
### Author:  [@Daniel\_Woodcock1](https://forum.dynamobim.com/u/Daniel_Woodcock1)
#### Post date: [October 26, 2019, 11:19am UTC](https://forum.dynamobim.com/t/why-cant-i-place-detail-component-by-curve/41252/23 "2019-10-26T11:19:11Z")
@rinag
Use this just under `import clr`…
`import sys pyt_path = r'C:\Program Files (x86)\IronPython 2.7\Lib' sys.path.append(pyt_path)`
This should fix it.
---
### Author:  [@rinag](https://forum.dynamobim.com/u/rinag)
#### Post date: [October 26, 2019, 12:50pm UTC](https://forum.dynamobim.com/t/why-cant-i-place-detail-component-by-curve/41252/25 "2019-10-26T12:50:02Z")
thank .
now i got this warning:
IronPythonEvaluator.EvaluateIronPythonScript operation failed.
unexpected token ‘pyt\_path’
---
### Author:  [@Daniel\_Woodcock1](https://forum.dynamobim.com/u/Daniel_Woodcock1)
#### Post date: [October 26, 2019, 1:21pm UTC](https://forum.dynamobim.com/t/why-cant-i-place-detail-component-by-curve/41252/26 "2019-10-26T13:21:10Z")
Hi @rinag, without showing your code it’s hard for me to determine your issue.
EDIT: Apologies, after looking at my first reply again, I seems like I have formatted the code wrong, looked ok on mobile. 😅 It should have read…
```
import sys
pyt_path = r'C:\Program Files (x86)\IronPython 2.7\Lib'
sys.path.append(pyt_path)
```
This is why it failed. However, please use this snippet of code for reference for traceback example…
```
"""
Description: Traceback example catching Divide by Zero Exception.
Author: Dan Woodcock
Website: https://danimosite.wordpress.com
Licence: N/A
"""
##### Imports #####
import clr
# Add IronPython Path to sys.path. This will expose additional IronPython Modules...
import sys
pyt_path = r'C:\Program Files (x86)\IronPython 2.7\Lib'
sys.path.append(pyt_path)
# Import traceback module...
import traceback
##### Inputs #####
a = IN[0] # Input any Number...
b = IN[1] # Make this Zero to see traceback error...
##### Main Script #####
# Try divide by zero. We know this will fail and trigger the traceback...
try:
OUT = a/b
except:
# Return Traceback....
OUT = traceback.format_exc()
```
Hope this helps.
D
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