Better error reporting in exceptions

src/Horizon/ApiClient.php

@@ -95,6 +95,7 @@ public function __construct($baseUrl, $networkPassphrase)
         $this->baseUrl = $baseUrl;
         $this->httpClient = new Client([
             'base_uri' => $baseUrl,
+            'exceptions' => false,
         ]);
         $this->networkPassphrase = $networkPassphrase;
     }
@@ -185,7 +186,7 @@ public function get($relativeUrl)
             $decoded = null;
             if ($e->getResponse()) {
                 $decoded = Json::mustDecode($e->getResponse()->getBody());
-                throw HorizonException::fromRawResponse($relativeUrl, 'GET', $decoded);
+                throw HorizonException::fromRawResponse($relativeUrl, 'GET', $decoded, $e);
             }
             // No response, something else went wrong
             else {

src/Horizon/Exception/HorizonException.php

@@ -121,7 +121,7 @@ public static function fromRawResponse($requestedUrl, $httpMethod, $raw, ClientE
      */
     public function __construct($title, Throwable $previous = null)
     {
-        parent::__construct($title, 0, 1, __FILE__, __LINE__, $previous);
+        parent::__construct($title, 0, 1, $previous->getFile(), $previous->getLine(), $previous);
     }
 
     /**

src/Transaction/TransactionBuilder.php

@@ -518,13 +518,31 @@ protected function generateSequenceNumber()
     {
         $this->ensureApiClient();
 
+        $account = $this->apiClient
+            ->getAccount($this->accountId->getAccountIdString());
+
+        if (!$account) {
+            throw new \ErrorException(sprintf('Account not found: %s', $this->accountId->getAccountIdString()));
+        }
+
         try {
             return $this->apiClient
                     ->getAccount($this->accountId->getAccountIdString())
                     ->getSequence() + 1
                 ;
         } catch (HorizonException $e) {
-            throw new \ErrorException(sprintf('Could not get sequence number for %s, does this account exist?', $this->accountId->getAccountIdString()));
+            $e->getTraceAsString();
+
+            print "**************\n" . $e->getTraceAsString() . "\n****************\n";
+
+            throw new \ErrorException(
+                sprintf('Could not get sequence number for %s, does this account exist?', $this->accountId->getAccountIdString()),
+                $e->getCode(),
+                $e->getSeverity(),
+                __FILE__,
+                __LINE__,
+                $e
+            );
         }
     }