I'm getting errors while using a DateField control. Once I click to display the DatePicker the control sends some debug messages. I'm using GXT 3-beta-4, but it's the same with all the betas from 1 to 4. Any suggestions?

Code:
00:00:45.766  [DEBUG] Rebinding com.sencha.gxt.theme.base.client.button.ButtonCellBaseAppearance.ButtonCellTemplates
  00:00:45.773  [DEBUG] Invoking generator com.sencha.gxt.core.rebind.XTemplatesGenerator
    00:00:45.775  [DEBUG] Creating XTemplate method iconWithStyles
      00:00:45.775  [DEBUG] Building SafeHtmlTemplates
        00:00:45.775  [DEBUG] Running class com.sencha.gxt.core.rebind.SafeHtmlTemplatesCreator
          00:00:45.775  [WARN] Error writing out generated unit at '/home/user/projects/java/project/target/.generated/com/sencha/gxt/theme/base/client/button/ButtonCellBaseAppearance_ButtonCellTemplates_iconWithStyles_SafeHtml__String_iconWrapClass__SafeStyles_imageStyles__SafeHtml_imageHtml___SafeHtmlTemplates.java': java.io.FileNotFoundException: /home/user/projects/java/project/target/.generated/com/sencha/gxt/theme/base/client/button/ButtonCellBaseAppearance_ButtonCellTemplates_iconWithStyles_SafeHtml__String_iconWrapClass__SafeStyles_imageStyles__SafeHtml_imageHtml___SafeHtmlTemplates.java (File name too long)
    00:00:45.779  [DEBUG] Creating XTemplate method textWithStyles
      00:00:45.779  [DEBUG] Building SafeHtmlTemplates
        00:00:45.779  [DEBUG] Running class com.sencha.gxt.core.rebind.SafeHtmlTemplatesCreator
          00:00:45.779  [WARN] Error writing out generated unit at '/home/user/projects/java/project/target/.generated/com/sencha/gxt/theme/base/client/button/ButtonCellBaseAppearance_ButtonCellTemplates_textWithStyles_SafeHtml__String_textClass__SafeStyles_textStyles__String_text___SafeHtmlTemplates.java': java.io.FileNotFoundException: /home/user/projects/java/project/target/.generated/com/sencha/gxt/theme/base/client/button/ButtonCellBaseAppearance_ButtonCellTemplates_textWithStyles_SafeHtml__String_textClass__SafeStyles_textStyles__String_text___SafeHtmlTemplates.java (File name too long)