Question: error in solving diffrential equation

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?