Internal error (bandgap_tools.F) during HSE calculation in VASP 6.4.3

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alicja_hertmanowska · #1 Post by **alicja_hertmanowska** » Tue Jul 28, 2026 10:32 am

Hi,

I'm trying an HSE with AEXX=0.15 calculation for a LiMn0.17Ni0 oxide structure with VASP 6.4.3. However, I'm getting a bug with this calculation, and I'm wondering how to resolve this issue and whether there is anything wrong with the calculation.

The error is:

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internal error in: bandgap_tools.F at line: 316

Could not determine new bound in interval bisection. Most likely this means that the eigenvalues are not sorted.

The electronic minimisation doesn't appear to converge. I also performed this calculation with HSE directly, without the PBE calculation.

In a previous attempt, I also got this error:

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internal error in: rot.F at line: 805

EDWAV: internal error, the gradient is not orthogonal 1 1 4.372e-3

Any help with this would be much appreciated - thank you.