Hi @SDA89,
Thanks for the details! I see now there are not more details — I was assuming that there may be an error message coming from QIIME2, which should provide a more informative method, but this confirms that it is an issue outside of QIIME2. It sounds like this is what's going on, which confirms my prediction that this is a memory issue.
Using a more powerful computer should solve your issue — SILVA can take quite a lot of memory to train, though, so you may want to use the pre-trained SILVA 119 full-length classifier if you cannot get access to enough power.
Good luck!