I can't save any simulink model.

When I try to save a simulink model I get the error:

An error occurred during a callback while saving 'xxx.slx'. The previously saved version of this file (if any) has not been changed. 

Undefined variable "rmigraph" or class "rmigraph.bdHasExternalData".

It even happens when saving a completely empty simulink model. Any other file manipulation with Matlab works.

A similar error shows up when trying to compile the simulink model:

Undefined variable "rmisl" or class "rmisl.blockTable".

My system:

• MATLAB R2014b
• Ubuntu 14.04

[Walter Roberson]

Both of those appear to be related to Simulink Verification

You could try reinstalling that product.

[Vaibhav Awale]

Can you check if you have anything written in PreSaveFcn callback?

Also you can try saving the model from command line using save_system

If above steps don't help, you can execute the following command at MATLAB command window and then try to save the model:

restoredefaultpath