diff --git a/src/ATBAPP/ATBDeviceControllerPlugin.cpp b/src/ATBAPP/ATBDeviceControllerPlugin.cpp
index a4a8de2..9ad08b3 100644
--- a/src/ATBAPP/ATBDeviceControllerPlugin.cpp
+++ b/src/ATBAPP/ATBDeviceControllerPlugin.cpp
@@ -502,7 +502,7 @@ bool ATBDeviceControllerPlugin::private_loadCashAgentLib(QString pluginName)
 
     if (!QLibrary::isLibrary(pluginName)) {
         qCritical() << "ATBDeviceControllerPlugin: can not load CashAgentLib: " << pluginName;
-        this->errorCode = 5;
+        this->errorCode = "CashAgentLib::NO_LIBRARY";
         this->errorDescription = "ERROR: can not load CashAgentLib: " + pluginName;
         return false;
     }
@@ -514,13 +514,15 @@ bool ATBDeviceControllerPlugin::private_loadCashAgentLib(QString pluginName)
     if (!pluginLoader->isLoaded()) {
         qCritical() << "ATBDeviceControllerPlugin: can not instantiate CashAgentLib: " << pluginName;
         qCritical() << "               error: " << pluginLoader->errorString();
-        this->errorCode = 6;
+        this->errorCode = "CashAgentLib::NO_INSTANCE";
         this->errorDescription = "ERROR: can not instantiate CashAgentLib: " + pluginName;
         return false;
     }
 
     if (plugin == nullptr) {
         qCritical() << "ATBDeviceControllerPlugin: plugin is NULL";
+        this->errorCode = "CashAgentLib::INSTANCE_IS_NULL";
+        this->errorDescription = "ERROR: CashAgentLib instance is NULL: " + pluginName;
     }
 
     qCritical() << "ATBDeviceControllerPlugin: instantiate CashAgentLib: " << pluginName;
@@ -529,6 +531,8 @@ bool ATBDeviceControllerPlugin::private_loadCashAgentLib(QString pluginName)
 
     if (this->hw == nullptr) {
         qCritical() << "ATBDeviceControllerPlugin: hw is NULL";
+        this->errorCode = "CashAgentLib::HW_IS_NULL";
+        this->errorDescription = "ERROR: CashAgentLib object_cast is NULL: " + pluginName;
     }
 
     qCritical() << "ATBDeviceControllerPlugin: loaded CashAgentLib";