The block plot produced by the Graph Template Language (GTL) BLOCKPLOT statement might be empty. This problem is most likely to occur if the template definition contains a LAYOUT LATTICE statement and the DISPLAY=NONE option is specified within the XAXISOPTS option in the LAYOUT OVERLAY statement that contains the BLOCKPLOT statement.

To circumvent the problem, add the TYPE=DISCRETE option within the XAXISOPTS option. For example:

layout overlay / xaxisopts=(type=discrete display=none);
   blockplot x=date block=type / display=(values label);
endlayout;

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