# JuMP Error: "Unexpected object missing in nonlinear expression"

**URL:** https://discourse.julialang.org/t/jump-error-unexpected-object-missing-in-nonlinear-expression/19151
**Category:** Optimization (Mathematical)
**Created:** [December 31, 2018, 5:17pm UTC](https://discourse.julialang.org/t/jump-error-unexpected-object-missing-in-nonlinear-expression/19151 "2018-12-31T17:17:48Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![odow](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/odow/32/28685_2.png) [@odow](https://discourse.julialang.org/u/odow)
#### Post date: [December 31, 2018, 7:14pm UTC](https://discourse.julialang.org/t/jump-error-unexpected-object-missing-in-nonlinear-expression/19151/2 "2018-12-31T19:14:57Z")

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Hi @krenova

It’s a bit hard to tell because variables like `α` aren’t defined so I can’t run your code.

However, `missing` is very suspect. Do you have missing values in your dataframe?

Take a read of [Please read: make it easier to help you](https://discourse.julialang.org/t/psa-make-it-easier-to-help-you/14757), and then update your post to include a minimum working example.

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