Title: Tracker error “100 Invalid payload string. Try clearing your WordPress cache”
Last modified: November 12, 2019

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# Tracker error “100 Invalid payload string. Try clearing your WordPress cache”

 *  Resolved [swissspaceboy](https://wordpress.org/support/users/swissspaceboy/)
 * (@swissspaceboy)
 * [6 years, 6 months ago](https://wordpress.org/support/topic/tracker-error-100-invalid-payload-string-try-clearing-your-wordpress-cache/)
 * Hello,
 * I have seen this tracker error just popping up:
    `100 Invalid payload string.
   Try clearing your WordPress cache`
 * I have this error since I want to track an external page with Slimstat (subfolder
   inside WP, not a subdomain). I added the required JS code to my HTML page, as
   I usual do. Now for this website, I cannot track that external webpage.
 * What is the reason for this error? How to reset the WP cache? I have no cache
   plugins, except Autoptimize and OPCache. Both have been flushed. Same result.
 * I am using an older version of the plugin as my website is still v4.8. The latest
   version requires v4.9 min so I need to upgrade first.
 * Thanks for any help.
 * Didier.

Viewing 1 replies (of 1 total)

 *  Thread Starter [swissspaceboy](https://wordpress.org/support/users/swissspaceboy/)
 * (@swissspaceboy)
 * [6 years, 1 month ago](https://wordpress.org/support/topic/tracker-error-100-invalid-payload-string-try-clearing-your-wordpress-cache/#post-12665990)
 * *bump*

Viewing 1 replies (of 1 total)

The topic ‘Tracker error “100 Invalid payload string. Try clearing your WordPress
cache”’ is closed to new replies.

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 * 1 reply
 * 1 participant
 * Last reply from: [swissspaceboy](https://wordpress.org/support/users/swissspaceboy/)
 * Last activity: [6 years, 1 month ago](https://wordpress.org/support/topic/tracker-error-100-invalid-payload-string-try-clearing-your-wordpress-cache/#post-12665990)
 * Status: resolved