What is the meaning of this sentence 'convergence not attached'?

I am doing a Static Analysis with pile/soil interaction. 

when i checked the output listing file, i checked the following note. 

What is the meaning of this sentence 'convergence not attached'?

*** NOTE - CONVERGENCE NOT ACHIEVED. TOTAL DIFFERENCE IS 0.158517E+00 FT.
SEASTATE WILL CONTINUE FOR TOTAL DIFFERENCE LESS THAN ONE PERCENT OF WAVE HEIGHT.

FOR FINAL ITERATION
WAVE HEIGHT DIFFERENCE = 0.121689E-02 FT.
MEAN SURFACE LEVEL DIFFERENCE = 0.225614E-02 FT.
DFSBC RMS DIFFERENCE = 0.155044E+00 FT.