I am on v1.1.0. tildeK is a sparse square matrix of size 70000, with about 8 entries in each row. Thus is it is very very sparse and there is no danger of running out of RAM. It is difficult to describe the construction of tildeK, it is built from a Gaussian kernel on a data-set.
If I could know what the error code means, I could figure out what is wrong. The error message is too cryptic at the moment.
But it seems to be a deficiency in the Julia SVD algorithm. tildeK is very sparse and very close to an identity matrix. The number of singular pairs I am asking for is also very low (2).