ver 0.7 Fatal error: URITemplateParser.php on line 30

try this..
in the plugin dir: google-drive-wp-media/google-api-php-client/src

open/edit Google_Client.php

change line 51
from

require_once 'external/URITemplateParser.php';

to

if(  !class_exists('URI_Template_Parser') ) {
	require_once 'external/URITemplateParser.php';
}

This gives the same error, but this time it points to another plugin called UserPro. This one has the ability to use a person’s Google-account to login (and a lot more) and seems to use the same Google-API-PHP-Client set (embedded in/with it’s own plugin, of course).

The error as it appeared: Fatal error: Cannot redeclare class URI_Template_Parser in /var/www/vhosts/xxx.xxx/subdomains/xxx/httpdocs/wp-content/plugins/userpro/lib/google/src/external/URITemplateParser.php on line 30.

Then, combining this new error togethet with your suggested solution I decided to make another change by removing the inclusion.

// userpro (Google) conflict....
// if(  !class_exists('URI_Template_Parser') ) {
//	require_once 'external/URITemplateParser.php';
// }

Right now I’m able to activate your plugin. ??

But, after setting e-mail. ID’s etc. another error appears ?? :
Fatal error: Call to undefined method apiOAuth2::setAssertionCredentials() in /var/www/vhosts/xxx.xx/subdomains/xxx/httpdocs/wp-content/plugins/google-drive-wp-media/google-api-php-client/src/Google_Client.php on line 345

Perhaps I made some mistake when copy-and-pasting the Google-API-settings, but even if so, that shouldn’t end up with a fatal error I guess?

did you have to try unsettng apiConfig variable?

in config.php

add this

if (isset($apiConfig)) {
    unset ($apiConfig);
}

it just my guess, i dont have plugin you mentioned above ??

I added the lines at the end of your plugin’s config.php.
Sorry, makes no difference…

I have released v0.8

worth to try

Updated to 0.8.
I still had to disable the ‘require_once ‘external/URITemplateParser.php’-part just to get the plugin installed.

The good news: the ability to get to the settings are back again and they’re saved. The bad: after saving the following messages and error/warning appear.

Great! All API settings successfuly saved.

Warning: openssl_sign() [function.openssl-sign]: Unknown signature algorithm. in /var/www/vhosts/xxx.xxx/subdomains/xxxx/httpdocs/wp-content/plugins/google-drive-wp-media/gdwpm-api/auth/Google_P12Signer.php on line 65

An error occurred: Unable to sign data

Updated to 0.9.
Disabling UserPro (which uses the same Google API) makes no difference.
Still getting error:

Warning: openssl_sign() [function.openssl-sign]: Unknown signature algorithm. in /var/www/vhosts/xxx.xxx/subdomains/xxx/httpdocs/wp-content/plugins/google-drive-wp-media/gdwpm-api/auth/Google_P12Signer.php on line 65
An error occurred: Unable to sign data

it should works in php v5.3.xx

ok.. try this
open/edit

gdwpm-api/auth/Google_P12Signer.php

find: (line 65)

if (!openssl_sign($data, $signature, $this->privateKey, "sha256")) {
      throw new Google_AuthException("Unable to sign data");
    }

and replace w/:

if (!openssl_sign($data, $signature, $this->privateKey, "sha256")) {
		$digests = openssl_get_md_methods();
		if (!openssl_sign($data, $signature, $this->privateKey, $digests[array_search('SHA256', $digests)])) {
			throw new Google_AuthException("Unable to sign data");
		}
    }

let me know the result

Still the same… ??
Guess it may be some conflict with some other plugin(s) that use the same Google API. But that’s just a guess.

have you try to install it on another blog on the same hosting?