in order to plot excitonic wave function yambo need to read the eigenvector of the BSE.
It seems that the database containing them (ndb.BSS_diago) is not found neither in the SAVE directory nor in the 2D_WR_WC directory. Check if it exists.
If it is not there, possible reasons are:
1) It is contained in a different directory (you used a different directory as -J in the BSE calculation)
2) Check that BSE run finished correctly
3) You did not diagonalise the BSE, but you solved it in an iterative way (haydock), in order to plot the exc-wf you need a direct diagonalization:
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BSSmod= "d"
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WRbsWF
Best,
Daniele