---
title: "SOLIDWORKS ERROR : MOD-DIAM"
description: When I apply a dimension to a circular edge, why does the diameter symbol Ø appear as ‘<MOD-DIAM>’?
---

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November 6, 2023

# SOLIDWORKS ERROR : MOD-DIAM

## When I apply a dimension to a circular edge, why does the diameter symbol Ø appear as ‘’?

![MOD-DIAM affiché au lieu d'un symbole de diamètre](https://www.javelin-tech.com/blog/wp-content/uploads/2015/04/Pic-4.jpg)The diameter symbol can appear as ‘<MOD-DIAM>’ if the *gtol.sym* file is missing or corrupt or the path to the **Symbol Library File** is invalid.

To resolve this issue, follow these steps:

1. Go to **System Options**  > **File Locations**.
2. ![](https://hub.ohmycad.com/hs-fs/hubfs/image-png-Nov-06-2023-09-48-33-2883-AM.png?width=643&height=772&name=image-png-Nov-06-2023-09-48-33-2883-AM.png)
3. In the **Show folders for** list, click **Symbol Library File**.  
   ![](https://hub.ohmycad.com/hs-fs/hubfs/image-png-Nov-06-2023-09-49-00-8229-AM.png?width=652&height=787&name=image-png-Nov-06-2023-09-49-00-8229-AM.png)

The typical folder path is:

 *C:\ProgramData\SOLIDWORKS\SOLIDWORKS [20XX]\lang\english*

If the path points to the previous version of the software, update the folder path to point to the current version.

3. Click on "**Edit All**", scroll down to "**Symbol Library File**" and in the "**New Path**" column, edit the date. 

![](https://hub.ohmycad.com/hs-fs/hubfs/image-png-Nov-06-2023-09-57-07-8444-AM.png?width=685&height=615&name=image-png-Nov-06-2023-09-57-07-8444-AM.png)

4. Copy and paste the new adress in the windows file explorer and open the folder to ensure that the ***gtol.sym*** file exists.

![](https://hub.ohmycad.com/hs-fs/hubfs/image-png-Nov-06-2023-09-14-14-4012-AM.png?width=685&height=257&name=image-png-Nov-06-2023-09-14-14-4012-AM.png)

5. If the file does not exist or you suspect that the file is corrupt, replace the file with this one : [gtol.sym](https://hub.ohmycad.com/hubfs/gtol.sym)

Still does not work ? Contact us at support@xdinnovation.eu