UnicodeDecodeError:‘ascii’编解码器无法解码位为0的字节0xe7:序数不在范围内(128)

I'm having troubles in encoding characters in utf-8. I'm using Django, and I get this error when I tried to send an Android notification with non-plain text. I tried to find where the source of the error and I managed to figure out that the source of the error is not in my project.I'm having troubles in encoding characters in u