Maven error

$ bazel run @unpinned_maven//:pin
INFO: Repository maven instantiated at:
  C:/users/veena/documents/github/oppia-android/WORKSPACE:160:14: in <toplevel>
  C:/users/veena/_bazel_veena/c6b4g6au/external/rules_jvm_external/defs.bzl:143:30: in maven_install
Repository rule pinned_coursier_fetch defined at:
  C:/users/veena/_bazel_veena/c6b4g6au/external/rules_jvm_external/coursier.bzl:1055:40: in <toplevel>
DEBUG: C:/users/veena/_bazel_veena/c6b4g6au/external/rules_jvm_external/third_party/bazel_json/lib/json_parser.bzl:840:18: JSON parsing failed. None
ERROR: An error occurred during the fetch of repository 'maven':
   Traceback (most recent call last):
        File "C:/users/veena/_bazel_veena/c6b4g6au/external/rules_jvm_external/coursier.bzl", line 373, column 13, in _pinned_coursier_fetch_impl
                fail("Failed to parse %s. Is this file valid JSON? The file may have been corrupted." % repository_ctx.path(repository_ctx.attr.maven_install_json) +
Error in fail: Failed to parse C:/users/veena/documents/github/oppia-android/third_party/maven_install.json. Is this file valid JSON? The file may have been corrupted.Conside
r regenerating maven_install.json with the following steps:
  1. Remove the maven_install_json attribute from your `maven_install` declaration for `@maven`.
  2. Regenerate `maven_install.json` by running the command: bazel run @maven//:pin  3. Add `maven_install_json = "//:maven_install.json"` into your `maven_install` declarati
on.
ERROR: C:/users/veena/documents/github/oppia-android/WORKSPACE:160:14: fetching pinned_coursier_fetch rule //external:maven: Traceback (most recent call last):
        File "C:/users/veena/_bazel_veena/c6b4g6au/external/rules_jvm_external/coursier.bzl", line 373, column 13, in _pinned_coursier_fetch_impl
                fail("Failed to parse %s. Is this file valid JSON? The file may have been corrupted." % repository_ctx.path(repository_ctx.attr.maven_install_json) +
Error in fail: Failed to parse C:/users/veena/documents/github/oppia-android/third_party/maven_install.json. Is this file valid JSON? The file may have been corrupted.Conside
r regenerating maven_install.json with the following steps:
  1. Remove the maven_install_json attribute from your `maven_install` declaration for `@maven`.
  2. Regenerate `maven_install.json` by running the command: bazel run @maven//:pin  3. Add `maven_install_json = "//:maven_install.json"` into your `maven_install` declarati
on.
ERROR: no such package '@maven//': Failed to parse C:/users/veena/documents/github/oppia-android/third_party/maven_install.json. Is this file valid JSON? The file may have be
en corrupted.Consider regenerating maven_install.json with the following steps:
  1. Remove the maven_install_json attribute from your `maven_install` declaration for `@maven`.
  2. Regenerate `maven_install.json` by running the command: bazel run @maven//:pin  3. Add `maven_install_json = "//:maven_install.json"` into your `maven_install` declarati
on.
INFO: Elapsed time: 2.318s
INFO: 0 processes.
FAILED: Build did NOT complete successfully (0 packages loaded)
FAILED: Build did NOT complete successfully (0 packages loaded)