diff --git a/src/main/java/ru/dmitriymx/corrector1s/gui/MainController.java b/src/main/java/ru/dmitriymx/corrector1s/gui/MainController.java
index 28c2cce..cbb2ae6 100644
--- a/src/main/java/ru/dmitriymx/corrector1s/gui/MainController.java
+++ b/src/main/java/ru/dmitriymx/corrector1s/gui/MainController.java
@@ -1,16 +1,21 @@
 package ru.dmitriymx.corrector1s.gui;
 
+import javafx.application.Platform;
 import javafx.event.ActionEvent;
 import javafx.fxml.FXML;
 import javafx.scene.control.*;
 import javafx.scene.layout.Pane;
+import javafx.scene.layout.VBox;
 import javafx.stage.FileChooser;
 import javafx.stage.Stage;
+import lombok.extern.slf4j.Slf4j;
+import ru.dmitriymx.corrector1s.Corrector1S;
 
-import java.io.File;
+import java.io.*;
 import java.nio.file.Files;
 import java.nio.file.Paths;
 
+@Slf4j
 public class MainController {
     private Stage stage;
     @FXML
@@ -54,6 +59,28 @@ public class MainController {
         return fileChooser;
     }
 
+    private Alert buildErrorDialog(String title, String text, Exception e) {
+        Alert alert = new Alert(Alert.AlertType.ERROR);
+        alert.setTitle(title);
+        alert.setHeaderText(text);
+
+        VBox dialogPaneContent = new VBox();
+        Label label = new Label("Stack Trace:");
+
+        StringWriter sw = new StringWriter();
+        PrintWriter pw = new PrintWriter(sw);
+        e.printStackTrace(pw);
+        String stackTrace = sw.toString();
+
+        TextArea textArea = new TextArea();
+        textArea.setText(stackTrace);
+
+        dialogPaneContent.getChildren().addAll(label, textArea);
+        alert.getDialogPane().setContent(dialogPaneContent);
+
+        return alert;
+    }
+
     @FXML
     public void initialize() {
         gonorar.setValueFactory(gonorarValueFactory);
@@ -83,21 +110,31 @@ public class MainController {
             progressBar.setProgress(0d);
 
             Runnable runnable = () -> {
-                do {
-                    try {
-                        Thread.sleep(500);
-                    } catch (InterruptedException e) {
-                        break;
-                    }
-                    progressBar.setProgress(progressBar.getProgress() + 0.1d);
-                } while (progressBar.getProgress() <= 1.0d);
+                Corrector1S corrector = new Corrector1S();
+                corrector.setSourceFile(new File(sourceFilePath.getText()));
+                if (saveAsCheckBox.isSelected()) {
+                    corrector.setTargetFile(new File(saveAsFilePath.getText()));
+                } else {
+                    corrector.setTargetFile(new File(sourceFilePath.getText()));
+                }
+                corrector.setHonorarium(gonorar.getValue());
+
+                progressBar.setProgress(0.3d);
+
+                try {
+                    corrector.check();
+                } catch (Exception e) {
+                    log.error("Analize input data", e);
+                    Alert alert = buildErrorDialog("Ошибка", "Ошибка при анализе входных данных", e);
+                    alert.showAndWait();
+                }
 
                 waitPane.setVisible(false);
                 mainPane.setOpacity(1.0d);
                 mainPane.setDisable(false);
             };
-            Thread thread = new Thread(runnable);
-            thread.start();
+
+            Platform.runLater(runnable);
         });
     }