[Help-glpk] What does this mean?

[hhb83]

Hello, when I solve a problem, "PROBLEM HAS NO PRIMAL FEASIBLE SOLUTION"
appeared immediately after the "Model has been successfully generated". But
the problem should be calculated for a little time. Dose it mean that my
model is not correct?

Another question is what does the sentences mean when glpsol solve the
problem, such as this:
    800: obj =  1.051500000e+002  infeas = 3.231e+001 (25) 
   1000: obj =  1.403333333e+002  infeas = 8.000e-001 (2) 
*  1038: obj =  1.379333333e+002  infeas = 5.157e-015 (1) 
*  1200: obj =  7.906666667e+001  infeas = 4.151e-015 (0) 
*  1225: obj =  7.820000000e+001  infeas = 5.274e-016 (0) 
OPTIMAL SOLUTION FOUND 
Integer optimization begins... 
+  1225: mip =     not found yet >=              -inf        (1; 0) 
+ 30729: >>>>>  7.820000000e+001 >=  7.820000000e+001 < 0.1% (324; 0) 
+ 30729: mip =  7.820000000e+001 >=     tree is empty   0.0% (0; 647) 

Thank you!
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