关于 Latex 中引用的一个问题

Question

我对 Latex 还不熟悉，正在用它写第一份报告。我的问题是引用并不总是有效。有些引用可以正常工作，而其他引用则在我的报告中显示为 [?]。

我在 overleaf 中收到的消息是 {Package natbib 警告：第 3 页上的引用“HOBOm”在输入行 6 上未定义。，您引用了参考书目中未包含的内容。请确保引用 (\cite{...}) 在您的参考书目中有相应的键，并且两者的拼写相同。}

尽管我的参考书目文件确实包含此来源。这是我的 ref.bib 文件中包含的来源。我还确保标签是正确的

我的 .bib 文件代码

@book{Hakim,
    author    = {Gregory Hakim and Jerome Patoux},
    title     = {Weather a concise introduction},
    year      = {2021},
    publisher = {Cambridge University Press},
    address   = {United Kingdom},
}
@proceedings{HOBOm,
    author = {Onset},
    title = {HOBO Data Logging Rain Gauge (RG3 and RG3-M) Manual},
    year = {2012},
    url = {https://www.onsetcomp.com/sites/default/files/resources-documents/10241-M%20MAN-RG3%20and%20RG3-M.pdf},
}
@article{virga,
    title="Is virga rain that evaporates before reaching the ground?",
    author="Fraser, Alistair B and Bohren, Craig F",
    journal="Monthly weather review",
    volume="120",
    number="8",
    pages="1565--1571",
    year="1992",
    URL={https://journals.ametsoc.org/view/journals/mwre/120/8/1520-0493_1992_120_1565_ivrteb_2_0_co_2.xml},
}
@book{modern,
    author    = {Devore, Jay L and Berk, Kenneth N and Carlton, Matthew A and others},
    title     = {Modern mathematical statistics with applications},
    year      = {2012},
    publisher = {Springer},
    address   = {USA},
}

@book{foken,
    author    = "Thomas Foken",
    title     = "Springer Handbook of Atmospheric Measurements",
    year      = "2021",
    publisher = "Springer Nature",
    address   = "Switzerland",
}



@article{x,
  title={Temporal precipitation variability versus altitude on a tropical high mountain: Observations and mesoscale atmospheric modelling},
  author={M{\"o}lg, Thomas and Chiang, John CH and Gohm, Alexander and Cullen, Nicolas J},
  journal={Quarterly Journal of the Royal Meteorological Society: A journal of the atmospheric sciences, applied meteorology and physical oceanography},
  volume={135},
  number={643},
  pages={1439--1455},
  year={2009},
  publisher={Wiley Online Library},
}

@misc{stamey2008modern,
  title={Modern mathematical Statistics with applications},
  author={Stamey, James},
  year={2008},
  publisher={Taylor \& Francis},
}
@article{uncertainity,
  title={Evaluation of measurement uncertainty for thermometers with calibration equations},
  author={Chen, Chiachung},
  journal={Accreditation and quality assurance},
  volume={11},
  pages={75--82},
  year={2006},
  publisher={Springer},
}
@manual{Tiny_guide,
    title = "Rugged, waterproof data logger with temperature and relative humidity probe",
    key="Gemnini Data Loggers",
    url= "https://assets.geminidataloggers.com/pdfs/original/3753-tgp-4505.pdf",
    year= "2019"
}