Error message while trying to reset memory

Hi

I'm trying to use the 'spagplot' command to create a spaghetti plot as follows:

spagplot hbA1cx J, id(nhs), if age<19 & diagdate>date("12/10/2015", "DMY")


But I get the following error message regarding memory:

'no room to add variables'
'Up to 5000 variables are currently allowed, although you reset the maximum using set maxvar..

I then tried to reset the memory using:

set maxvar 10000 [,permanently] clear

I had to use the clear option to force the above - but I still get an error message saying that data in memory would be lost. Is there a way around this?

Thanks

/Amal