Error changing menu image

[carloshc95]

I have created a new theme I have installed in my alfresco following the steps indicated in this link

https://flex-solution.com/theme/

but, the menu image does not change, the alfresco logo continues to appear. The colors of the letter, menu etc if they have changed perfectly.
I have tried to change the image from the administrator tools but I get an error. (My image is 42x35 pixels)

How can I fix this error?

Thank you

[flex-solution]

Hi Carlos,

it is weird. Everything should work correctly.

We will test your theme and I will let you know where is the problem

[flex-solution]

We just tested the last theme you generated. Everything works as expected.

Here is the whole video of testing process: 

Maybe it conflicts with another extension?

Please attach the logs of the error and we will try to figure out what is wrong