Df read library error

Grasshopper was in progress. It was going smoothly without any problems. One day, I ran a grasshopperr, and an error appeared. There was a red error, so I connected the envimet5 folder. So it turned into an orange error. However, the error has not been resolved yet. The name of the material was not visible. This orange errors mean 1. Connect the output of the current mainspace.

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Hello, I am also having this problem for some time. Were you able to find a solution?
Thank you so much in advance!