Question:error in solving diffrential equation

Question:error in solving diffrential equation

Maple 2015

print(`output redirected...`); # input placeholder
d ph
---- = (1 - yc) pc + yh prj + urd prd + ugd pgd - yc ph,
dt

d pc                        d pa
---- = yc ph - (2 - yc) pc, ---- = pc ya - pf,
dt                          dt

d prj                 d prd
----- = pa yrj + prj, ----- = pa yrd - prd urd,
dt                    dt

d pgd
----- = pa ygd - pgd ugd,
dt

d pf
---- = (1 - ygd - yrj - yrd) pa + (1 - yh) prj
dt
ics := ph(0) = 1, pc(0) = 0, pa(0) = 0, prj(0) = 0, prd(0) = 0, pgd(0) = 0, pf(0) = 0;
print(`output redirected...`); # input placeholder
ph(0) = 1, pc(0) = 0, pa(0) = 0, prj(0) = 0, prd(0) = 0,

pgd(0) = 0, pf(0) = 0

i write this equations in maple

but i get this error

Error, (in dsolve) ambiguous input: the variables {pa, pc, pf, pgd, ph, prd, prj} and the functions {pa(0), pc(0), pf(0), pgd(0), ph(0), prd(0), prj(0)} cannot both appear in the system

can anyone help me?

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