CIF fields that are available for some atoms, but not others
Your loop defines 8 records. That works fine for heavy elements. However, the lines with hydrogen atoms have only 6 items. That's the reason why this error is reported (all you records are not multiplier of 8).

Usually in refinement the hydrogen atom's $U_{iso}$ is 1.2–1.5 bigger than this of atom to which the H is bound (smaller 1.2 for more constrained movements like on aromatic carbons, bigger 1.5 for aliphatic)

Try something like this:

N1   1    -0.8852(9) 0.120(1)   -1.0300(8) Biso 3.1(2) N
H1a  2    -0.9650000 0.08500000 -1.0010000 Biso 4.     H
H1b  3    -0.8800000 -0.0800000 -1.0330000 Biso 4.     H
C2   4    -0.739(1)  0.049(2)   -0.940(1)  Biso 3.9(2) C
H2   5    -0.7460000 -0.0800000 -0.9360000 Biso 4.     H
C3   6    -0.614(1)  0.092(1)   -0.988(1)  Biso 5.1(3) C