# Cannot use ff-c++

**URL:** <https://community.freefem.org/t/cannot-use-ff-c/3475>\
**Category:** FreeFEM installation\
**Created:** [September 11, 2024, 8:09am UTC](https://community.freefem.org/t/cannot-use-ff-c/3475 "2024-09-11T08:09:24Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![MariamiMamgo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/mariamimamgo/32/2641_2.png) [@MariamiMamgo](https://community.freefem.org/u/MariamiMamgo)\
**Post date:** [September 11, 2024, 8:09am UTC](https://community.freefem.org/t/cannot-use-ff-c/3475/1 "2024-09-11T08:09:24Z")

</div>

Hello, i am new to freefem++ and my goal is to link c++ code with my ff code using ff-c++, but i have following error and i am not sure what is the problem:  
ff-c++ classes.cpp  
‘ff-c++’ is not recognized as an internal or external command,  
operable program or batch file.  
I am using windows 11.