Interpreting output from Limit estimation

Hi, I calculated the limit of a function:

if true
  % code
end
y = (C - (exp(-2.*g.*i.*x./h)).*(C - T) + (g.*x)/2.*h.*i)
S = limit(y,a,0)
vpa(S)

where all the g, h, C and T are given. The result is however puzzling:

ans =

x*2.8179665895658061064402481282017e-62i + limit(1/a^(1/2) - exp(-(x*6248546050018338930688i)/616503364953199)*(1/a^(1/2) - 5748108426137127/1018517988167243043134222844204689080525734196832968125318070224677190649881668353091698688), a, 0)

does this mean the limit can't be found?