I am using propane to cool down 17,7 MPa air to 98K (liquefaction) and heat it back to 209K at 6,5 MPa. The HXs gives the fallowing error and T-Q diagram. How do I solve this problem?

WARNING WHILE GENERATING RESULTS FOR UNIT OPERATIONS BLOCK: "HX" (MODEL:

"HEATX")

FLASH RESULTS ARE WITHIN TOLERANCE, BUT MAY BE UNSATISFACTORY BECAUSE

EXTRAPOLATED EOS VAPOR VOLUME ROOT WAS USED FOR PROPERTY CALCULATIONS

(T= 119.6575 K, P= 6.5000D+06 Pa).

* WARNING WHILE GENERATING RESULTS FOR UNIT OPERATIONS BLOCK: "HX" (MODEL:

"HEATX")

FLASH RESULTS ARE WITHIN TOLERANCE, BUT MAY BE UNSATISFACTORY BECAUSE

EXTRAPOLATED EOS VAPOR VOLUME ROOT WAS USED FOR PROPERTY CALCULATIONS

(T= 117.5935 K, P= 6.5000D+06 Pa).

* WARNING WHILE GENERATING RESULTS FOR UNIT OPERATIONS BLOCK: "$MHXHTR"

(MODEL: "MHEATER")

CROSSOVER FOUND DURING INTERNAL ZONE ANALYSIS