Error in fine-tuning a pre-trained FasterRCNN instance segmentation model (Detectron2) on my custom dataset

Question

from detectron2.engine import DefaultTrainer
from detectron2.config import get_cfg
import os

cfg = get_cfg()
cfg.merge_from_file(model_zoo.get_config_file("COCO-InstanceSegmentation/mask_rcnn_R_50_FPN_3x.yaml"))
cfg.DATASETS.TRAIN = ("microcontroller_train",)
cfg.DATASETS.TEST = ()
cfg.DATALOADER.NUM_WORKERS = 2
cfg.MODEL.WEIGHTS = model_zoo.get_checkpoint_url("COCO-InstanceSegmentation/mask_rcnn_R_50_FPN_3x.yaml")
cfg.SOLVER.IMS_PER_BATCH = 2
cfg.SOLVER.BASE_LR = 0.00025
cfg.SOLVER.MAX_ITER = 1000
cfg.SOLVER.STEPS = []        # do not decay learning rate
cfg.MODEL.ROI_HEADS.NUM_CLASSES = 88

os.makedirs(cfg.OUTPUT_DIR, exist_ok=True)
trainer = DefaultTrainer(cfg) 
trainer.resume_or_load(resume=False)
trainer.train()

Error:

SizeMismatchError: Caught SizeMismatchError in DataLoader worker process 0.
Original Traceback (most recent call last):
  File "/usr/local/lib/python3.7/dist-packages/torch/utils/data/_utils/worker.py", line 287, in _worker_loop
    data = fetcher.fetch(index)
  File "/usr/local/lib/python3.7/dist-packages/torch/utils/data/_utils/fetch.py", line 32, in fetch
    data.append(next(self.dataset_iter))
  File "/usr/local/lib/python3.7/dist-packages/detectron2/data/common.py", line 201, in __iter__
    yield self.dataset[idx]
  File "/usr/local/lib/python3.7/dist-packages/detectron2/data/common.py", line 90, in __getitem__
    data = self._map_func(self._dataset[cur_idx])
  File "/usr/local/lib/python3.7/dist-packages/detectron2/utils/serialize.py", line 26, in __call__
    return self._obj(*args, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/detectron2/data/dataset_mapper.py", line 155, in __call__
    utils.check_image_size(dataset_dict, image)
  File "/usr/local/lib/python3.7/dist-packages/detectron2/data/detection_utils.py", line 204, in check_image_size
    + " Please check the width/height in your annotation."
detectron2.data.detection_utils.SizeMismatchError: Mismatched image shape for image Microcontroller Segmentation/train/image25.jpg, got (1080, 1527), expect (800, 600). Please check the width/height in your annotation.