The reference to entity must end with the ';' delimiter. on UI Page

[sammarcow]

Creating a UI Page,

<a href=

<a href="https://slack.com/oauth/authorize?scope=incoming-webhook,commands,bot&client_id=121325453792.1213561..."><img alt="Add to Slack" height="40" width="139" src="https://platform.slack-edge.com/img/add_to_slack.png" srcset="https://platform.slack-edge.com/img/add_to_slack.png 1x, https://platform.slack-edge.com/img/add_to_slack@2x.png 2x" /></a>

2x" /></a>

Error at line (4) The reference to entity "client_id" must end with the ';' delimiter.

Removing "client_id=121325453792.121356192369" resolves the error - why? Adding a semicolon after the 9 does not resolve error.

[drjohnchun]

Can you try, instead of using "&"

&amp;client_id=...

as in

<a href="https://slack.com/oauth/authorize?scope=incoming-webhook,commands,bot&amp;client_id=121325453792.121... alt="Add to Slack" height="40" width="139" src="https://platform.slack-edge.com/img/add_to_slack.png" srcset="https://platform.slack-edge.com/img/add_to_slack.png 1x, https://platform.slack-edge.com/img/add_to_slack@2x.png 2x" /></a>   

Hope this helps.

Please feel free to connect, follow, mark helpful / answer, like, endorse.

John Chun, PhD PMP

Winner of November 2016 Members' Choice Award

[drjohnchun · Accepted solution]

The reason for this is when the parser sees "&", it thinks you have an encoded entity, for example "&amp;", and expects a terminating ";" which is not there, thus the error.