cannot redeclare error

It is because the same class has already been instated.
An easy fix would (for future proofing against other widgets/plugins using the yelp oauth api), (for the dev)
go into the “lib/” folder
Find the file
oauth.php
find the code

Line 7: class OAuthException extends Exception {
Line 13: class OAuthConsumer {
Line 29: class OAuthToken {
Line 49: OAuthUtil::urlencode_rfc3986($this->key) .
Line 51: OAuthUtil::urlencode_rfc3986($this->secret);
Line 63: abstract class OAuthSignatureMethod {
Line 104: class OAuthSignatureMethod_HMAC_SHA1 extends OAuthSignatureMethod {
Line 118: $key_parts = OAuthUtil::urlencode_rfc3986($key_parts);
Line 131: class OAuthSignatureMethod_PLAINTEXT extends OAuthSignatureMethod {
Line 151: $key_parts = OAuthUtil::urlencode_rfc3986($key_parts);
Line 167: abstract class OAuthSignatureMethod_RSA_SHA1 extends OAuthSignatureMethod {
Line 227: class OAuthRequest {
Line 238: $parameters = array_merge( OAuthUtil::parse_parameters(parse_url($http_url, PHP_URL_QUERY)), $parameters);
Line 265: $request_headers = OAuthUtil::get_headers();
Line 268: $parameters = OAuthUtil::parse_parameters($_SERVER[‘QUERY_STRING’]);
Line 286: $header_parameters = OAuthUtil::split_header(
Line 294: return new OAuthRequest($http_method, $http_url, $parameters);
Line 302: $defaults = array(“oauth_version” => OAuthRequest::$version,
Line 303: “oauth_nonce” => OAuthRequest::generate_nonce(),
Line 304: “oauth_timestamp” => OAuthRequest::generate_timestamp(),
Line 311: return new OAuthRequest($http_method, $http_url, $parameters);
Line 355: return OAuthUtil::build_http_query($params);
Line 372: $parts = OAuthUtil::urlencode_rfc3986($parts);
Line 419: return OAuthUtil::build_http_query($this->parameters);
Line 428: $out = ‘Authorization: OAuth realm=”‘ . OAuthUtil::urlencode_rfc3986($realm) . ‘”‘;
Line 431: $out = ‘Authorization: OAuth’;
Line 437: throw new OAuthException(‘Arrays not supported in headers’);
Line 440: $out .= OAuthUtil::urlencode_rfc3986($k) .
Line 442: OAuthUtil::urlencode_rfc3986($v) .
Line 488: class OAuthServer {
Line 571: throw new OAuthException(“OAuth version ‘$version’ not supported”);
Line 580: $signature_method = $request instanceof OAuthRequest
Line 587: throw new OAuthException(‘No signature method parameter. This parameter is required’);
Line 593: throw new OAuthException(
Line 606: $consumer_key = $request instanceof OAuthRequest
Line 611: throw new OAuthException(“Invalid consumer key”);
Line 616: throw new OAuthException(“Invalid consumer”);
Line 626: $token_field = $request instanceof OAuthRequest
Line 634: throw new OAuthException(“Invalid $token_type token: $token_field”);
Line 645: $timestamp = $request instanceof OAuthRequest
Line 648: $nonce = $request instanceof OAuthRequest
Line 666: throw new OAuthException(“Invalid signature”);
Line 676: throw new OAuthException(
Line 684: throw new OAuthException(
Line 696: throw new OAuthException(
Line 708: throw new OAuthException(“Nonce already used: $nonce”);
Line 715: class OAuthDataStore {
Line 742: class OAuthUtil {
Line 774: $params[$h] = OAuthUtil::urldecode_rfc3986(empty($matches[3][$i]) ? $matches[4][$i] : $matches[3][$i]);
Line 840: $parameter = OAuthUtil::urldecode_rfc3986($split[0]);
Line 841: $value = isset($split[1]) ? OAuthUtil::urldecode_rfc3986($split[1]) : ”;
Line 865: $keys = OAuthUtil::urlencode_rfc3986(array_keys($params));
Line 866: $values = OAuthUtil::urlencode_rfc3986(array_values($params));

Replacce the “OAuth…” with say “YWPOAuth…” like this:

Line 7: class YWPYWPOAuthException extends Exception {
Line 13: class YWPYWPOAuthConsumer {
Line 29: class YWPYWPOAuthToken {
Line 49: YWPOAuthUtil::urlencode_rfc3986($this->key) .
Line 51: YWPOAuthUtil::urlencode_rfc3986($this->secret);
Line 63: abstract class YWPOAuthSignatureMethod {
Line 104: class YWPOAuthSignatureMethod_HMAC_SHA1 extends YWPOAuthSignatureMethod {
Line 118: $key_parts = YWPOAuthUtil::urlencode_rfc3986($key_parts);
Line 131: class YWPOAuthSignatureMethod_PLAINTEXT extends YWPOAuthSignatureMethod {
Line 151: $key_parts = YWPOAuthUtil::urlencode_rfc3986($key_parts);
Line 167: abstract class YWPOAuthSignatureMethod_RSA_SHA1 extends YWPOAuthSignatureMethod {
Line 227: class YWPOAuthRequest {
Line 238: $parameters = array_merge( YWPOAuthUtil::parse_parameters(parse_url($http_url, PHP_URL_QUERY)), $parameters);
Line 265: $request_headers = YWPOAuthUtil::get_headers();
Line 268: $parameters = YWPOAuthUtil::parse_parameters($_SERVER[‘QUERY_STRING’]);
Line 286: $header_parameters = YWPOAuthUtil::split_header(
Line 294: return new YWPOAuthRequest($http_method, $http_url, $parameters);
Line 302: $defaults = array(“YWPOAuth_version” => YWPOAuthRequest::$version,
Line 303: “YWPOAuth_nonce” => YWPOAuthRequest::generate_nonce(),
Line 304: “YWPOAuth_timestamp” => YWPOAuthRequest::generate_timestamp(),
Line 311: return new YWPOAuthRequest($http_method, $http_url, $parameters);
Line 355: return YWPOAuthUtil::build_http_query($params);
Line 372: $parts = YWPOAuthUtil::urlencode_rfc3986($parts);
Line 419: return YWPOAuthUtil::build_http_query($this->parameters);
Line 428: $out = ‘Authorization: YWPOAuth realm=”‘ . YWPOAuthUtil::urlencode_rfc3986($realm) . ‘”‘;
Line 431: $out = ‘Authorization: YWPOAuth’;
Line 437: throw new YWPOAuthException(‘Arrays not supported in headers’);
Line 440: $out .= YWPOAuthUtil::urlencode_rfc3986($k) .
Line 442: YWPOAuthUtil::urlencode_rfc3986($v) .
Line 488: class YWPOAuthServer {
Line 571: throw new YWPOAuthException(“YWPOAuth version ‘$version’ not supported”);
Line 580: $signature_method = $request instanceof YWPOAuthRequest
Line 587: throw new YWPOAuthException(‘No signature method parameter. This parameter is required’);
Line 593: throw new YWPOAuthException(
Line 606: $consumer_key = $request instanceof YWPOAuthRequest
Line 611: throw new YWPOAuthException(“Invalid consumer key”);
Line 616: throw new YWPOAuthException(“Invalid consumer”);
Line 626: $token_field = $request instanceof YWPOAuthRequest
Line 634: throw new YWPOAuthException(“Invalid $token_type token: $token_field”);
Line 645: $timestamp = $request instanceof YWPOAuthRequest
Line 648: $nonce = $request instanceof YWPOAuthRequest
Line 666: throw new YWPOAuthException(“Invalid signature”);
Line 676: throw new YWPOAuthException(
Line 684: throw new YWPOAuthException(
Line 696: throw new YWPOAuthException(
Line 708: throw new YWPOAuthException(“Nonce already used: $nonce”);
Line 715: class YWPOAuthDataStore {
Line 742: class YWPOAuthUtil {
Line 774: $params[$h] = YWPOAuthUtil::urldecode_rfc3986(empty($matches[3][$i]) ? $matches[4][$i] : $matches[3][$i]);
Line 840: $parameter = YWPOAuthUtil::urldecode_rfc3986($split[0]);
Line 841: $value = isset($split[1]) ? YWPOAuthUtil::urldecode_rfc3986($split[1]) : ”;
Line 865: $keys = YWPOAuthUtil::urlencode_rfc3986(array_keys($params));
Line 866: $values = YWPOAuthUtil::urlencode_rfc3986(array_values($params));

now go into the file in the root of the plugin widget.php

find this:

Line 45: $token = new OAuthToken($yelp_widget_token, $yelp_widget_token_secret);
Line 51: $consumer = new OAuthConsumer($yelp_widget_consumer_key, $yelp_widget_consumer_secret);
Line 54: $signature_method = new OAuthSignatureMethod_HMAC_SHA1();
Line 98: $oauthrequest = OAuthRequest::from_consumer_and_token($consumer, $token, ‘GET’, $unsigned_url, $urlparams);
Line 98: $oauthrequest = OAuthRequest::from_consumer_and_token($consumer, $token, ‘GET’, $unsigned_url, $urlparams);

replace it by:

Line 45: $token = new YWPOAuthToken($yelp_widget_token, $yelp_widget_token_secret);
Line 51: $consumer = new YWPOAuthConsumer($yelp_widget_consumer_key, $yelp_widget_consumer_secret);
Line 54: $signature_method = new YWPOAuthSignatureMethod_HMAC_SHA1();
Line 98: $oauthrequest = YWPOAuthRequest::from_consumer_and_token($consumer, $token, ‘GET’, $unsigned_url, $urlparams);
Line 98: $oauthrequest = YWPOAuthRequest::from_consumer_and_token($consumer, $token, ‘GET’, $unsigned_url, $urlparams);

That should take care of any other class conflicts, even if someone alters the oauth.php in another plugin