# Error when use Opt-in plugin in wordpress: Failed to parse XML-RPC request: Invalid byte 1 of 1-byte UTF-8 sequence

**URL:** <https://integration.keap.com/t/error-when-use-opt-in-plugin-in-wordpress-failed-to-parse-xml-rpc-request-invalid-byte-1-of-1-byte-utf-8-sequence/77471>\
**Category:** API Q&A\
**Created:** [May 28, 2020, 10:44am UTC](https://integration.keap.com/t/error-when-use-opt-in-plugin-in-wordpress-failed-to-parse-xml-rpc-request-invalid-byte-1-of-1-byte-utf-8-sequence/77471 "2020-05-28T10:44:56Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![T\_Minh\_Tu\_n](https://avatars.discourse-cdn.com/v4/letter/t/65b543/32.png) [@T\_Minh\_Tu\_n](https://integration.keap.com/u/T_Minh_Tu_n)\
**Post date:** [May 28, 2020, 10:44am UTC](https://integration.keap.com/t/error-when-use-opt-in-plugin-in-wordpress-failed-to-parse-xml-rpc-request-invalid-byte-1-of-1-byte-utf-8-sequence/77471/1 "2020-05-28T10:44:56Z")

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![faile](https://us1.discourse-cdn.com/flex019/uploads/infusionsoft1/original/2X/d/df6dda4b87dd0102083befda0e9b28f1dae9315c.jpeg)  
I test my Opt-in form (plugin Infusionsoft Official Opt-in Forms in Wordpress), I fill with the Vietnamese characters, but it cannot admit data and show this erro " Failed to parse XML-RPC request: Invalid byte 1 of 1-byte UTF-8 sequence.".  
Please help me!  
Thanks so much!

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**Author:** ![John\_Borelli](https://sea1.discourse-cdn.com/flex019/user_avatar/integration.keap.com/john_borelli/32/11880_2.png) [@John\_Borelli](https://integration.keap.com/u/John_Borelli)\
**Post date:** [May 30, 2020, 4:39pm UTC](https://integration.keap.com/t/error-when-use-opt-in-plugin-in-wordpress-failed-to-parse-xml-rpc-request-invalid-byte-1-of-1-byte-utf-8-sequence/77471/2 "2020-05-30T16:39:46Z")

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Yeah, vientamese characters won’t carry over without issues because the collation (internationalization) doesn’t exist for them from what I understand.