GUI in matlab ERROR after reopening

i dont know that my GUI works perfectly fine when i make it for the first time. when i turn my laptop on after turn off, it says:

Unrecognized function or variable 'config_test'.

whereas config_test is a file in my code and i have added it to function already.

best regards

[Walter Roberson]

Check to see if the code for config_test is still error-free. If it does not parse properly then you can get that kind of situation.