Structural modelling in PLS-SEM model with seminr (R)

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I am trying to compute a PlS-SEM model using seminr, but it doesn't seem to work well: I can't even show the summary of the model. Is it because the structural model isn't well defined? These are the path coefficients in my model:

Depression Anxiety WB
Depression 0.00 0.59715665 -0.72310198
Anxiety 0.2889459 0.00 -0.03600999
WB -0.43997596 -0.04427055 0.00

I have another two variables in my model.

Also, it seems impossible to bootstrap this model.

When I simplify the model and remove some of the paths, it works. Is it because the SEM theory? I would like to create a explorative model so my aim is to relate all the variables between them. Is this possible using SEM? Does the matrix need to be triangular?

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