R Quantreg package: "CI" constraint in qss

Hello,


For a few large set of points, whenever I use a "CI" constraint in the qss
term, I get the following error message: 
Warning message:
In rq.fit.sfnc(x, y, tau = tau, ...) :
  tiny diagonals replaced with Inf when calling blkfct

Without any constraint, these sets work well. Does anyone know how to solve
this problem?

Thank you very much,

TDB

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