TYPO3 Exception 1439555561¶
Below, the TYPO3 community may have provided additional information or solutions for this exception. However, these may or may not apply to your particular case. If you can provide more information, you should come back here and add your experience and solution steps to this issue once you have resolved it.
General TYPO3 troubleshooting tips can be found in the section “Troubleshooting” of the menu, and live support is available in the TYPO3 Slack channel #typo3-cms.
The composer.json found for extension “…” is invalid!¶
composer.json file has a syntax error. Use the command line
composer.phar validate to get details about this error and the line
number which causes this error.
This error can also occur if the
composer.json file is not accessible.
Alternatively, use a JSON online validator and copy-paste the contents of your
composer.json. Then you will see the exact syntax error in this JSON
file. E.g. here.