Axmol 2.1.3 create button with image wrong color

[NgVThangBz]

i create button with Image:
button displayed in green color but Image is black.

Does anyone have the same problem, I used other images but it didn't have any problem, however with the 2 images below it got error, you can see the image and my code below :
(I didn't encounter it in the previous version nor the beta)

[rh101]

Which platform is this running on? Windows? iOS? Android? etc..

[NgVThangBz]

i use IOS and Android (Haven't tested on Windows yet)

[rh101]

The images being used are in an unsupported pixel format. Change the files to RGBA (32bit), and they will work.

[NgVThangBz]

whether axmol can convert formats to RGBA, for example R8,
Currently I am loading the image in R8 format, and it has an alpha error
Is there any solution other than changing the image?