# Unsatisfiable requirements for package ForwardDiff

**URL:** <https://discourse.julialang.org/t/unsatisfiable-requirements-for-package-forwarddiff/4922>\
**Category:** General Usage\
**Tags:** pkg\
**Created:** [July 18, 2017, 11:54am UTC](https://discourse.julialang.org/t/unsatisfiable-requirements-for-package-forwarddiff/4922 "2017-07-18T11:54:47Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![tkelman](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/tkelman/32/692_2.png) [@tkelman](https://discourse.julialang.org/u/tkelman)\
**Post date:** [July 19, 2017, 7:29pm UTC](https://discourse.julialang.org/t/unsatisfiable-requirements-for-package-forwarddiff/4922/8 "2017-07-19T19:29:55Z")

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You can set up independent JULIA\_PKGDIR locations with separate sets of versions, but you can’t load two different versions of the same package into the same Julia session at the same time. If you absolutely need to do that then maybe you could make a copy of one of the versions and locally rename it, but that’s pretty messy.

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_[View the full topic](https://discourse.julialang.org/t/unsatisfiable-requirements-for-package-forwarddiff/4922)._