Error while using Layout mode's emulator.

[#1]

Hi Team,

When I switch you Layout mode and try clicking on the different option in emulator it throws below attached error. I am able to arrange the width of the component in the grid. 
I am using SPA AEM 6.4.3 version. But WKND sample works as expected.

@Jörg_Hoh  @vanegi  @Arun_Patidar 

[#2 · Accepted solution]

How did you created the SPA project for 6.4?
I am using AEMaaCS and SPA layout mode works fine there for custom projects.