controlling variables in panel data

[mosib74]

I am working on the Chinese economy and I want to estimate the Chinese export demand function for 1988-2011 with more than 130 countries. I want to estimate the regression equation given below.
log(export)it=β0+β1log(realgdp)it+β2log(population)it+β3politicalstabilityit+β4realexchangerateit+εit
Where log(export)it is the (log) of the export from china to other countries and t=1988,…,2011.
my research, I want to control for the effect of Chinese GDP and population on Chinese export in EViews 7 in a panel estimation. without controlling for these two variables I can run a panel estimation in EViews but when i try torun my estimation with control variables eviews give the error(singular matrix). Any help is greatly appreciated.
malik fahim

[EViews Gareth]

Dummy variable trap.

[mosib74]

can you please let me know how can i solve this problem.

[EViews Gareth]

Drop one of your dummies.