– At the very top of the file, paste:

Clear your Microsoft Edge / Internet Explorer cache, as SketchUp utilizes these system engines to render internal plugin dialogs. Mac: Clear your Safari cache and restart your machine. 5. Alternative Solutions for Concrete Detailing

The original TOH Rebars V120 was built for SketchUp 8 and 2013. Modern SketchUp versions (especially 2021+) have changed three critical things:

: Broken data during the download process.

This is the most common V120 error. The script expects imperial units but gets metric, or vice versa.

If the TOH Rebars V120 extension remains completely incompatible with your specific hardware configuration or SketchUp version, consider shifting your workflow to modern alternatives that receive active developer support:

The most common point of failure occurs right at the start: downloading corrupted files from unverified third-party sources. Use Official Channels First

: SketchUp relies on the Ruby programming language, and outdated extension code can trigger syntax errors upon startup.

Change your file extension from TOH_Rebars_V120.rbz to TOH_Rebars_V120.zip .

For structural engineers and architects using SketchUp, rebar detailing is often a missing link in the workflow. has historically been one of the most popular plugins to bridge this gap, offering automated placement, scheduling, and 2D drawing generation.