When was the first tabernacle in the wilderness built?

I do not believe that any specific place is mentioned in scripture as to where the tabernacle was first errected. I would sugest that it would have been sometime after the jews had crossed over the waters, maybe even in the promised land.

The first mention of it being used was in Exodus i.e. " And they shall be upon Aaron, and upon his sons, when they come in unto the tabernacle of the congregation". See Exodus 28:43.

Sorry I cannot be of more help to you.