While working on force.com IDE this week, I started getting below error
Unable to update project properties: Element {urn:partner.soap.sforce.com}returnFieldDataTypes invalid at this location
![Eclipse Force.com IDE - MARS.1](https://i0.wp.com/www.jitendrazaa.com/blog/wp-content/uploads/2016/01/Eclipse-Force.com-IDE-MARS.1.png?resize=455%2C303&ssl=1)
I was using Eclipse Mars.1. The reason was that, I updated my force.com IDE to version 36 and my org was supporting API 35 only I guess.
So, I solved it by uninstalling Force.com IDE by navigating to “Help | Installation Details | Force.com IDE | Uninstall”.
Once, Force.com IDE is uninstalled, install it again however with some change as shown in below image.
![Resolve Salesforce Force.com IDE error](https://i0.wp.com/www.jitendrazaa.com/blog/wp-content/uploads/2016/01/2-Uncheck-latest-version-while-installing-force.com-IDE.png?resize=1020%2C946&ssl=1)
On first screen of installation, we need to select only “version 35” and uncheck check-box saying “show only the latest version of available software”. After this screen, we need to follow steps as shown in screen.
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