# \#mfc120u-dll

**URL:** https://tech-community.robotics.abb.com/tag/mfc120u-dll/278.md

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## [System Builder Error!!!!!! Cannot get System Builder to Work.](https://tech-community.robotics.abb.com/t/system-builder-error-cannot-get-system-builder-to-work/6630)

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**Author:** [@1\_milad\_3](https://tech-community.robotics.abb.com/u/1_milad_3)\
**Replies:** 1\
**Last updated:** [May 27, 2015, 12:42pm UTC](https://tech-community.robotics.abb.com/t/system-builder-error-cannot-get-system-builder-to-work/6630 "2015-05-27T12:42:34Z")

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I don’t know what the problem is, but my RobotStudio will not allow me to use System Builder. Every time I try and use it I get an error. The first time this happened RobotStudio told me I was missing a .dll file. I got …