Cannot install simplexml extension on ubuntu 16.04

Question

I'm running php5.6 on ubuntu 16.04. I am trying to upload files to an s3 bucket following steps from aws. When running the code I am getting this error:

PHP Fatal error:  Class 'SimpleXMLElement' not found in .../vendor/aws/aws-sdk-php/src/Api/Parser/PayloadParserTrait.php on line 44
PHP Stack trace:
PHP   1. {main}() .../upload_to_s3.php:0
PHP   2. upload_to_s3() .../upload_to_s3.php:75
PHP   3. Aws\S3\S3Client->putObject() .../upload_to_s3.php:66
PHP   4. Aws\AwsClient->__call() .../upload_to_s3.php:66
PHP   5. Aws\AwsClient->execute() .../vendor/aws/aws-sdk-php/src/AwsClientTrait.php:86
PHP   6. GuzzleHttp\Promise\Promise->wait() .../vendor/aws/aws-sdk-php/src/AwsClientTrait.php:58
PHP   7. GuzzleHttp\Promise\Promise->waitIfPending() .../vendor/guzzlehttp/promises/src/Promise.php:62
PHP   8. GuzzleHttp\Promise\Promise->invokeWaitList() .../vendor/guzzlehttp/promises/src/Promise.php:226
PHP   9. GuzzleHttp\Promise\Promise->waitIfPending() .../vendor/guzzlehttp/promises/src/Promise.php:269
PHP  10. GuzzleHttp\Promise\Promise->invokeWaitList() .../vendor/guzzlehttp/promises/src/Promise.php:226
PHP  11. GuzzleHttp\Promise\Promise->waitIfPending() .../vendor/guzzlehttp/promises/src/Promise.php:269
PHP  12. GuzzleHttp\Promise\Promise->invokeWaitFn() .../vendor/guzzlehttp/promises/src/Promise.php:224
PHP  13. GuzzleHttp\Handler\CurlMultiHandler->execute() .../vendor/guzzlehttp/promises/src/Promise.php:248
PHP  14. GuzzleHttp\Handler\CurlMultiHandler->tick() .../vendor/guzzlehttp/guzzle/src/Handler/CurlMultiHandler.php:145
PHP  15. GuzzleHttp\Promise\TaskQueue->run() .../vendor/guzzlehttp/guzzle/src/Handler/CurlMultiHandler.php:118
PHP  16. GuzzleHttp\Promise\RejectedPromise::GuzzleHttp\Promise\{closure}() .../vendor/guzzlehttp/promises/src/TaskQueue.php:48
PHP  17. GuzzleHttp\Promise\Promise::GuzzleHttp\Promise\{closure}() .../vendor/guzzlehttp/promises/src/RejectedPromise.php:42
PHP  18. GuzzleHttp\Promise\Promise::callHandler() .../vendor/guzzlehttp/promises/src/Promise.php:169
PHP  19. Aws\WrappedHttpHandler->Aws\{closure}() .../vendor/guzzlehttp/promises/src/Promise.php:204
PHP  20. Aws\WrappedHttpHandler->parseError() .../vendor/aws/aws-sdk-php/src/WrappedHttpHandler.php:101
PHP  21. call_user_func:{.../vendor/aws/aws-sdk-php/src/WrappedHttpHandler.php:178}() .../vendor/aws/aw    s-sdk-php/src/WrappedHttpHandler.php:178
PHP  22. Aws\Api\ErrorParser\XmlErrorParser->__invoke() .../vendor/aws/aws-sdk-php/src/WrappedHttpHandler.php:178
PHP  23. Aws\Api\ErrorParser\XmlErrorParser->parseXml() .../vendor/aws/aws-sdk-php/src/Api/ErrorParser/XmlErrorParser.php:42

I have tried install php-xml and get this:

php-xml is already the newest version (1:7.1+55+ubuntu16.04.1+deb.sury.org+1)

Trying to install a specific version ie. apt install php5.6-xml doesn't find packages and the simplexml.conf file is missing from mods-available.

I have a simplexml.ini in /etc/php/7.0/mods-available and have tried switching to php7.0 to try and correct these issues to no avail.

Any help on this would be much appreciated.

Answer 1

Found out my problem was with my aws user key. I was using the wrong key and it kept throwing this error. If anyone comes across this same issue, double check your key and hopefully you can save yourself the headache. No extensions needed to be installed to get it to work properly.