Strange, I think it is because there is a space in the path to your lib and you are using windows (C:/Users/DELL 5530/Documents/R/win-library/3.6). Possible fixes:
1- try updating to the latest version of devtools
2-download source, and install as I posted here. You may need to manually install the dependencies.
3-move your R libraries to a new directory which avoids 'DELL 5530'