Why do I receive error " Unable to create com.mathwo​rks.toolbo​x.shared.c​ontrollib.​desktop.To​olGroupWra​pper$Defau​ltToolGrou​p" when using Simulink response optimization?

Hi,

whenever I click the button Design Variables Set in Simulink's response optimization window, I get the following error:

Warning: Error occurred while executing callback:
Error using sldodialogs.DesignVarsEditorGC/update (line 296)
Java exception occurred:
java.lang.OutOfMemoryError: Java heap space

  at java.lang.String.toCharArray(Unknown Source)

  at sun.swing.SwingUtilities2.clipString(Unknown Source)

  at javax.swing.SwingUtilities.layoutCompoundLabelImpl(Unknown Source)

  at javax.swing.SwingUtilities.layoutCompoundLabel(Unknown Source)

  at javax.swing.plaf.basic.BasicLabelUI.layoutCL(Unknown Source)

  at javax.swing.plaf.basic.BasicLabelUI.getPreferredSize(Unknown Source)

  at javax.swing.JComponent.getPreferredSize(Unknown Source)
...

Then I usually close the response optimization window again (since the error kept me from selecting any design variables), which gives this warning:

Warning: Unable to create com.mathworks.toolbox.shared.controllib.desktop.ToolGroupWrapper$DefaultToolGroup, for details see
 C:\Users\user\AppData\Local\Temp\MATLABDesktopCreateError.log

Why do I get these errors?