Goodness-of-fit indices in R - Stack Overflow

I am new to R and I have the following output when I use summary on a "sem" model. However in most expositions on R on the Net, I find an RMSEA index and additional goodness-of-fit indices below the

r - could not compute modification indices; information matrix is singular. error message, sem with formative dependant variable in Rstudio - Cross Validated

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