What is the error message?

RPC_ERROR
Odoo Server Error
Traceback (most recent call last):
File "/home/odoo/src/odoo/17.0/odoo/tools/cache.py", line 99, in lookup
r = d[key]
File "<decorator-gen-5>", line 2, in __getitem__
File "/home/odoo/src/odoo/17.0/odoo/tools/func.py", line 87, in locked
return func(inst, *args, **kwargs)
File "/home/odoo/src/odoo/17.0/odoo/tools/lru.py", line 34, in __getitem__
a = self.d[obj]
KeyError: ('ir.model.data', <function IrModelData._xmlid_lookup at 0x7ffb4fe39d80>, 'im_livechat.im_livechat_channel_data')

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/home/odoo/src/odoo/17.0/odoo/tools/convert.py", line 556, in _tag_root
f(rec)
File "/home/odoo/src/odoo/17.0/odoo/tools/convert.py", line 421, in _tag_record
f_val = self.id_get(f_ref, raise_if_not_found=nodeattr2bool(rec, 'forcecreate', True))
File "/home/odoo/src/odoo/17.0/odoo/tools/convert.py", line 538, in id_get
res = self.model_id_get(id_str, raise_if_not_found)
File "/home/odoo/src/odoo/17.0/odoo/tools/convert.py", line 544, in model_id_get
return self.env['ir.model.data']._xmlid_to_res_model_res_id(id_str, raise_if_not_found=raise_if_not_found)
File "/home/odoo/src/odoo/17.0/odoo/addons/base/models/ir_model.py", line 2182, in _xmlid_to_res_model_res_id
return self._xmlid_lookup(xmlid)
File "<decorator-gen-43>", line 2, in _xmlid_lookup
File "/home/odoo/src/odoo/17.0/odoo/tools/cache.py", line 104, in lookup
value = d[key] = self.method(*args, **kwargs)
File "/home/odoo/src/odoo/17.0/odoo/addons/base/models/ir_model.py", line 2175, in _xmlid_lookup
raise ValueError('External ID not found in the system: %s' % xmlid)
ValueError: External ID not found in the system: im_livechat.im_livechat_channel_data

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/home/odoo/src/odoo/17.0/odoo/http.py", line 1722, in _serve_db
return service_model.retrying(self._serve_ir_http, self.env)
File "/home/odoo/src/odoo/17.0/odoo/service/model.py", line 133, in retrying
result = func()
File "/home/odoo/src/odoo/17.0/odoo/http.py", line 1749, in _serve_ir_http
response = self.dispatcher.dispatch(rule.endpoint, args)
File "/home/odoo/src/odoo/17.0/odoo/http.py", line 1953, in dispatch
result = self.request.registry['ir.http']._dispatch(endpoint)
File "/home/odoo/src/odoo/17.0/addons/website/models/ir_http.py", line 235, in _dispatch
response = super()._dispatch(endpoint)
File "/home/odoo/src/odoo/17.0/odoo/addons/base/models/ir_http.py", line 222, in _dispatch
result = endpoint(**request.params)
File "/home/odoo/src/odoo/17.0/odoo/http.py", line 722, in route_wrapper
result = endpoint(self, *args, **params_ok)
File "/home/odoo/src/odoo/17.0/addons/web/controllers/dataset.py", line 28, in call_button
action = self._call_kw(model, method, args, kwargs)
File "/home/odoo/src/odoo/17.0/addons/web/controllers/dataset.py", line 20, in _call_kw
return call_kw(request.env[model], method, args, kwargs)
File "/home/odoo/src/odoo/17.0/odoo/api.py", line 468, in call_kw
result = _call_kw_multi(method, model, args, kwargs)
File "/home/odoo/src/odoo/17.0/odoo/api.py", line 453, in _call_kw_multi
result = method(recs, *args, **kwargs)
File "/home/odoo/src/odoo/17.0/odoo/addons/base/models/res_config.py", line 616, in execute
installation_status = self._install_modules(to_install)
File "/home/odoo/src/odoo/17.0/odoo/addons/base/models/res_config.py", line 32, in _install_modules
result = to_install_modules.button_immediate_install()
File "/home/odoo/src/custom/trial/saas_trial/models/module.py", line 103, in button_immediate_install
return super(IrModuleModule, self).button_immediate_install()
File "<decorator-gen-77>", line 2, in button_immediate_install
File "/home/odoo/src/odoo/17.0/odoo/addons/base/models/ir_module.py", line 75, in check_and_log
return method(self, *args, **kwargs)
File "/home/odoo/src/odoo/17.0/odoo/addons/base/models/ir_module.py", line 465, in button_immediate_install
return self._button_immediate_function(self.env.registry[self._name].button_install)
File "/home/odoo/src/custom/trial/saas_trial/models/module.py", line 70, in _button_immediate_function
res = super(IrModuleModule, self)._button_immediate_function(function)
File "/home/odoo/src/odoo/17.0/odoo/addons/base/models/ir_module.py", line 589, in _button_immediate_function
registry = modules.registry.Registry.new(self._cr.dbname, update_module=True)
File "<decorator-gen-16>", line 2, in new
File "/home/odoo/src/odoo/17.0/odoo/tools/func.py", line 87, in locked
return func(inst, *args, **kwargs)
File "/home/odoo/src/odoo/17.0/odoo/modules/registry.py", line 113, in new
odoo.modules.load_modules(registry, force_demo, status, update_module)
File "/home/odoo/src/odoo/17.0/odoo/modules/loading.py", line 480, in load_modules
processed_modules += load_marked_modules(env, graph,
File "/home/odoo/src/odoo/17.0/odoo/modules/loading.py", line 364, in load_marked_modules
loaded, processed = load_module_graph(
File "/home/odoo/src/odoo/17.0/odoo/modules/loading.py", line 227, in load_module_graph
load_data(env, idref, mode, kind='data', package=package)
File "/home/odoo/src/odoo/17.0/odoo/modules/loading.py", line 71, in load_data
tools.convert_file(env, package.name, filename, idref, mode, noupdate, kind)
File "/home/odoo/src/odoo/17.0/odoo/tools/convert.py", line 627, in convert_file
convert_xml_import(env, module, fp, idref, mode, noupdate)
File "/home/odoo/src/odoo/17.0/odoo/tools/convert.py", line 693, in convert_xml_import
obj.parse(doc.getroot())
File "/home/odoo/src/odoo/17.0/odoo/tools/convert.py", line 613, in parse
self._tag_root(de)
File "/home/odoo/src/odoo/17.0/odoo/tools/convert.py", line 556, in _tag_root
f(rec)
File "/home/odoo/src/odoo/17.0/odoo/tools/convert.py", line 569, in _tag_root
raise ParseError('while parsing %s:%s, somewhere inside\n%s' % (
odoo.tools.convert.ParseError: while parsing /home/odoo/src/odoo/17.0/addons/website_livechat/data/website_livechat_data.xml:4, somewhere inside
<record id="website.default_website" model="website">
<field name="channel_id" ref="im_livechat.im_livechat_channel_data"/>
</record>

The above server error caused the following client error:
RPC_ERROR: Odoo Server Error
at makeErrorFromResponse (https://ofhistoricalsociety.odoo.com/web/assets/a8adc19/web.assets_web.min.js:2874:163)
at XMLHttpRequest.<anonymous> (https://ofhistoricalsociety.odoo.com/web/assets/a8adc19/web.assets_web.min.js:2878:13)

Check if the "im_livechat" odoo module is installed and active. Or try to update it.

It is installed, but I don't see anything promoting me to update the module

You can update it from command line:
odoo -u im_livechat

Okay thank you, that worked.