# ERROR: "Warning manifold obj nb:4 adj 4 of dim =2 freefem"

**URL:** <https://community.freefem.org/t/error-warning-manifold-obj-nb-4-adj-4-of-dim-2-freefem/2603>\
**Category:** General Discussion\
**Created:** [July 13, 2023, 5:27pm UTC](https://community.freefem.org/t/error-warning-manifold-obj-nb-4-adj-4-of-dim-2-freefem/2603 "2023-07-13T17:27:39Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![luca.liverotti](https://avatars.discourse-cdn.com/v4/letter/l/977dab/32.png) [@luca.liverotti](https://community.freefem.org/u/luca.liverotti)\
**Post date:** [July 13, 2023, 5:27pm UTC](https://community.freefem.org/t/error-warning-manifold-obj-nb-4-adj-4-of-dim-2-freefem/2603/1 "2023-07-13T17:27:39Z")

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Hi everyone.  
I’m writing a .msh file (“new.msh”) in order to get a new mesh starting from another one (I have to perform some local transformations, that’s the reason I’m writing a new .msh).

The fact is the following. The line

mesh Th = readmesh(“new.msh”);

does not lead to an error,

BUT

when I try to save the mesh Th

savemesh(Th,“new2.msh”)

I get the error “Warning manifold obj nb:4 adj 4 of dim =2 freefem”

Could someone explain me the meaning of this error, and how is it possible a behavior like this ?

Thanks in advance.

Luca

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**Author:** ![frederichecht](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/frederichecht/32/15_2.png) [@frederichecht](https://community.freefem.org/u/frederichecht)\
**Post date:** [July 14, 2023, 9:49am UTC](https://community.freefem.org/t/error-warning-manifold-obj-nb-4-adj-4-of-dim-2-freefem/2603/2 "2023-07-14T09:49:24Z")

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This is not a error juste a warning so you mesh is strange !