crontab.xml:

<?xml version="1.0"?> <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Cron:etc/crontab.xsd">     <group id="default">         <job name="test_product_import" instance="Test\ImportExport\Cron\ProductImport" method="execute">             <schedule>* * * * *</schedule>         </job>     </group> </config> 

Php File that gets called by cron:

<?php  namespace Test\ImportExport\Cron;  class ProductImport {     protected $  trace;      public function __construct(         \Test\Core\Model\Trace $  trace     )     {         $  this->trace = $  trace;     }      public function execute()     {         $  this->trace->writeTrace("Test");     } } 

Error message in cron_schedule table :

Warning: fopen(app/code/Test/Trace.txt): failed to open stream: No such file or directory in /var/www/www.example.com/app/code/Test/Core/Model/Trace.php on line 12

On line 12 in this file:

$  tracelog = fopen("app/code/Test/Trace.txt", "a") or die("Unable to open file!"); 

In SSH I executed

php magento cron:run

and I got the error. Since I assume a permission problem I tried

sudo -u www-data php magento cron:run

same issue. What’s wrong?