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page_id: wsd-precheck-issue-4bb81dae
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title: "Thread: Precheck issue"
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route: /evidence/i-information/general/threads/precheck-issue
section: reference
access: public
summary: 6 Discord messages from ℹ️ - Information/general/threads/precheck-issue.md.
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---
# Thread: Precheck issue
Category: **ℹ️ - Information**
Parent channel: **#general**
Thread ID: `1440291245162496181`
Messages: **6**
## message-1440291250644189289
**2025-11-18T10:43:13.471+00:00 — urish**
- Message ID: `1440291250644189289`
- Author ID: `732347216412278825`
- Nickname: urish
- User name: urish
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1440291245162496181/1440291250644189289
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/precheck-issue/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/precheck-issue/2025-11/2025-11.json
**Content**
````text
@Leo Moser (mole99) any idea if this is a setup issue, actual issue with our GDS, or a precheck bug?
```
Error: Couldn't find ID cell: 'gf180mcu_ws_ip__id'.
[10:40:12] ERROR Subprocess had a non-zero exit. step.py:1383
[10:40:12] ERROR Last 1 line(s): step.py:1388
Error: Couldn't find ID cell:
'gf180mcu_ws_ip__id'.
[10:40:12] ERROR Full log file: step.py:1391
'runs/RUN_2025-11-18_10-40-06/3-klayout-generat
eid/klayout-generateid.log'
PrecheckFlow - Stage 3 - Generate ID ━━━━━━╸ 2/9 0:00:06
Error: The precheck failed with the following exception:
Generate ID: subprocess (1, ['/nix/store/5fq98lrmhfma10j7bv85dfi3wxs9hddi-python3-3.12.10-env/bin/python3.12', '/home/runner/work/tinytapeout-gf-0p2-staging/tinytapeout-gf-0p2-staging/gf180mcu-precheck/scripts/klayout/generate_id.py', '/home/runner/work/tinytapeout-gf-0p2-staging/tinytapeout-gf-0p2-staging/gf180mcu-precheck/runs/RUN_2025-11-18_10-40-06/1-klayout-readlayout/tt_gf_wrapper.gds', '/home/runner/work/tinytapeout-gf-0p2-staging/tinytapeout-gf-0p2-staging/gf180mcu-precheck/runs/RUN_2025-11-18_10-40-06/3-klayout-generateid/tt_gf_wrapper.gds', '--id', 'FFFFFFFF']) failed
```
````
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---
## message-1440304918316712118
**2025-11-18T11:37:32.098+00:00 — Leo Moser (mole99) (@mole99)**
- Message ID: `1440304918316712118`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1440291245162496181/1440304918316712118
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/precheck-issue/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/precheck-issue/2025-11/2025-11.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1440291245162496181/1440291250644189289
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**Content**
```text
Hi Uri, this is an actual issue that could be reported more clearly. The chip needs an instance of `gf180mcu_ws_ip__id` somewhere in the design. It will get replaced with the QR-code that contains the ID for your design.
You can take a look at the example design how to place it in the bottom left corner outside of the padring.
```
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---
## message-1440305299734134934
**2025-11-18T11:39:03.035+00:00 — urish**
- Message ID: `1440305299734134934`
- Author ID: `732347216412278825`
- Nickname: urish
- User name: urish
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1440291245162496181/1440305299734134934
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/precheck-issue/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/precheck-issue/2025-11/2025-11.json
**Content**
```text
Thanks!
Cc @tnt
```
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---
## message-1440305408374866002
**2025-11-18T11:39:28.937+00:00 — urish**
- Message ID: `1440305408374866002`
- Author ID: `732347216412278825`
- Nickname: urish
- User name: urish
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1440291245162496181/1440305408374866002
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/precheck-issue/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/precheck-issue/2025-11/2025-11.json
**Content**
```text
Does the precheck report all the issues found or only the first one?
```
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---
## message-1440306057598599312
**2025-11-18T11:42:03.724+00:00 — tnt (@246tnt)**
- Message ID: `1440306057598599312`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1440291245162496181/1440306057598599312
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/precheck-issue/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/precheck-issue/2025-11/2025-11.json
**Content**
```text
@Leo Moser (mole99) Does the instance need to be at the top level or can it be in a subcell ?
```
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---
## message-1440307287372595281
**2025-11-18T11:46:56.925+00:00 — Leo Moser (mole99) (@mole99)**
- Message ID: `1440307287372595281`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1440291245162496181/1440307287372595281
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/precheck-issue/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/precheck-issue/2025-11/2025-11.json
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- https://discord.com/channels/1361349522684510449/1440291245162496181/1440306057598599312
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**Content**
```text
It can be anywhere in the hierarchy. I simply get the cell from the layout context and replace its contents. Let me know if that doesn't work.
```
**Reactions**
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---