I'm debugging a suspected issue in a web page with Telerik controls and after clicking a confirm button, I capture this error:
VM1307:4 Uncaught SyntaxError: missing ) after argument list
at Sys._ScriptLoader._loadScriptsInternal (Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=RadScriptManager1_TSM&compress=1&_TSM_CombinedScripts_=%3b%3bSystem.Web.Extensions%2c+Version%3d4.0.0.0%2c+Culture%3dneutral%2c+PublicKeyToken%3d31bf3856ad364e35%3aen-US%3a14a9c2eb-bf69-4b0e-9aa0-eb85640f0e43%3aea597d4b%3ab25378d2%3bTelerik.Web.UI%2c+Version%3d2014.2.724.45%2c+Culture%3dneutral%2c+PublicKeyToken%3d121fae78165ba3d4%3aen-US%3a6915a8c2-c063-435a-ab31-d2d2285652a6%3a16e4e7cd%3af7645509%3a24ee1bba%3ae330518b%3a2003d0b8%3ac128760b%3a1e771326%3a88144a7a%3ac8618e41%3a1a73651d%3a333f8d94%3aa1a4383a%3aed16cbdc%3a6d43f6d9%3ab7778d6c%3af46195d3%3aaa288e2d%3a258f1c72%3a92fe8ea0%3afa31b949%3a874f8ea2%3adc7e0bd%3a1569bb5f%3a63b115ed%3a30f1f089%3a19620875%3a490a9d4e%3a7c926187%3a8674cba1%3ac08e9f8a%3aa51ee93e%3a59462f1%3a58366029%3a2bef5fcc%3ae06b58fd%3abd8f85e4:15:4736)
at Sys._ScriptLoader._loadScriptsInternal (Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=RadScriptManager1_TSM&compress=1&_TSM_CombinedScripts_=%3b%3bSystem.Web.Extensions%2c+Version%3d4.0.0.0%2c+Culture%3dneutral%2c+PublicKeyToken%3d31bf3856ad364e35%3aen-US%3a14a9c2eb-bf69-4b0e-9aa0-eb85640f0e43%3aea597d4b%3ab25378d2%3bTelerik.Web.UI%2c+Version%3d2014.2.724.45%2c+Culture%3dneutral%2c+PublicKeyToken%3d121fae78165ba3d4%3aen-US%3a6915a8c2-c063-435a-ab31-d2d2285652a6%3a16e4e7cd%3af7645509%3a24ee1bba%3ae330518b%3a2003d0b8%3ac128760b%3a1e771326%3a88144a7a%3ac8618e41%3a1a73651d%3a333f8d94%3aa1a4383a%3aed16cbdc%3a6d43f6d9%3ab7778d6c%3af46195d3%3aaa288e2d%3a258f1c72%3a92fe8ea0%3afa31b949%3a874f8ea2%3adc7e0bd%3a1569bb5f%3a63b115ed%3a30f1f089%3a19620875%3a490a9d4e%3a7c926187%3a8674cba1%3ac08e9f8a%3aa51ee93e%3a59462f1%3a58366029%3a2bef5fcc%3ae06b58fd%3abd8f85e4:15:4794)
at Sys._ScriptLoader._loadScriptsInternal (Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=RadScriptManager1_TSM&compress=1&_TSM_CombinedScripts_=%3b%3bSystem.Web.Extensions%2c+Version%3d4.0.0.0%2c+Culture%3dneutral%2c+PublicKeyToken%3d31bf3856ad364e35%3aen-US%3a14a9c2eb-bf69-4b0e-9aa0-eb85640f0e43%3aea597d4b%3ab25378d2%3bTelerik.Web.UI%2c+Version%3d2014.2.724.45%2c+Culture%3dneutral%2c+PublicKeyToken%3d121fae78165ba3d4%3aen-US%3a6915a8c2-c063-435a-ab31-d2d2285652a6%3a16e4e7cd%3af7645509%3a24ee1bba%3ae330518b%3a2003d0b8%3ac128760b%3a1e771326%3a88144a7a%3ac8618e41%3a1a73651d%3a333f8d94%3aa1a4383a%3aed16cbdc%3a6d43f6d9%3ab7778d6c%3af46195d3%3aaa288e2d%3a258f1c72%3a92fe8ea0%3afa31b949%3a874f8ea2%3adc7e0bd%3a1569bb5f%3a63b115ed%3a30f1f089%3a19620875%3a490a9d4e%3a7c926187%3a8674cba1%3ac08e9f8a%3aa51ee93e%3a59462f1%3a58366029%3a2bef5fcc%3ae06b58fd%3abd8f85e4:15:4794)
at Sys._ScriptLoader._nextSession (Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=RadScriptManager1_TSM&compress=1&_TSM_CombinedScripts_=%3b%3bSystem.Web.Extensions%2c+Version%3d4.0.0.0%2c+Culture%3dneutral%2c+PublicKeyToken%3d31bf3856ad364e35%3aen-US%3a14a9c2eb-bf69-4b0e-9aa0-eb85640f0e43%3aea597d4b%3ab25378d2%3bTelerik.Web.UI%2c+Version%3d2014.2.724.45%2c+Culture%3dneutral%2c+PublicKeyToken%3d121fae78165ba3d4%3aen-US%3a6915a8c2-c063-435a-ab31-d2d2285652a6%3a16e4e7cd%3af7645509%3a24ee1bba%3ae330518b%3a2003d0b8%3ac128760b%3a1e771326%3a88144a7a%3ac8618e41%3a1a73651d%3a333f8d94%3aa1a4383a%3aed16cbdc%3a6d43f6d9%3ab7778d6c%3af46195d3%3aaa288e2d%3a258f1c72%3a92fe8ea0%3afa31b949%3a874f8ea2%3adc7e0bd%3a1569bb5f%3a63b115ed%3a30f1f089%3a19620875%3a490a9d4e%3a7c926187%3a8674cba1%3ac08e9f8a%3aa51ee93e%3a59462f1%3a58366029%3a2bef5fcc%3ae06b58fd%3abd8f85e4:15:5243)
at Sys._ScriptLoader._loadScriptsInternal (Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=RadScriptManager1_TSM&compress=1&_TSM_CombinedScripts_=%3b%3bSystem.Web.Extensions%2c+Version%3d4.0.0.0%2c+Culture%3dneutral%2c+PublicKeyToken%3d31bf3856ad364e35%3aen-US%3a14a9c2eb-bf69-4b0e-9aa0-eb85640f0e43%3aea597d4b%3ab25378d2%3bTelerik.Web.UI%2c+Version%3d2014.2.724.45%2c+Culture%3dneutral%2c+PublicKeyToken%3d121fae78165ba3d4%3aen-US%3a6915a8c2-c063-435a-ab31-d2d2285652a6%3a16e4e7cd%3af7645509%3a24ee1bba%3ae330518b%3a2003d0b8%3ac128760b%3a1e771326%3a88144a7a%3ac8618e41%3a1a73651d%3a333f8d94%3aa1a4383a%3aed16cbdc%3a6d43f6d9%3ab7778d6c%3af46195d3%3aaa288e2d%3a258f1c72%3a92fe8ea0%3afa31b949%3a874f8ea2%3adc7e0bd%3a1569bb5f%3a63b115ed%3a30f1f089%3a19620875%3a490a9d4e%3a7c926187%3a8674cba1%3ac08e9f8a%3aa51ee93e%3a59462f1%3a58366029%3a2bef5fcc%3ae06b58fd%3abd8f85e4:15:4894)
at Sys._ScriptLoader._nextSession (Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=RadScriptManager1_TSM&compress=1&_TSM_CombinedScripts_=%3b%3bSystem.Web.Extensions%2c+Version%3d4.0.0.0%2c+Culture%3dneutral%2c+PublicKeyToken%3d31bf3856ad364e35%3aen-US%3a14a9c2eb-bf69-4b0e-9aa0-eb85640f0e43%3aea597d4b%3ab25378d2%3bTelerik.Web.UI%2c+Version%3d2014.2.724.45%2c+Culture%3dneutral%2c+PublicKeyToken%3d121fae78165ba3d4%3aen-US%3a6915a8c2-c063-435a-ab31-d2d2285652a6%3a16e4e7cd%3af7645509%3a24ee1bba%3ae330518b%3a2003d0b8%3ac128760b%3a1e771326%3a88144a7a%3ac8618e41%3a1a73651d%3a333f8d94%3aa1a4383a%3aed16cbdc%3a6d43f6d9%3ab7778d6c%3af46195d3%3aaa288e2d%3a258f1c72%3a92fe8ea0%3afa31b949%3a874f8ea2%3adc7e0bd%3a1569bb5f%3a63b115ed%3a30f1f089%3a19620875%3a490a9d4e%3a7c926187%3a8674cba1%3ac08e9f8a%3aa51ee93e%3a59462f1%3a58366029%3a2bef5fcc%3ae06b58fd%3abd8f85e4:15:5243)
at Sys._ScriptLoader.loadScripts (Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=RadScriptManager1_TSM&compress=1&_TSM_CombinedScripts_=%3b%3bSystem.Web.Extensions%2c+Version%3d4.0.0.0%2c+Culture%3dneutral%2c+PublicKeyToken%3d31bf3856ad364e35%3aen-US%3a14a9c2eb-bf69-4b0e-9aa0-eb85640f0e43%3aea597d4b%3ab25378d2%3bTelerik.Web.UI%2c+Version%3d2014.2.724.45%2c+Culture%3dneutral%2c+PublicKeyToken%3d121fae78165ba3d4%3aen-US%3a6915a8c2-c063-435a-ab31-d2d2285652a6%3a16e4e7cd%3af7645509%3a24ee1bba%3ae330518b%3a2003d0b8%3ac128760b%3a1e771326%3a88144a7a%3ac8618e41%3a1a73651d%3a333f8d94%3aa1a4383a%3aed16cbdc%3a6d43f6d9%3ab7778d6c%3af46195d3%3aaa288e2d%3a258f1c72%3a92fe8ea0%3afa31b949%3a874f8ea2%3adc7e0bd%3a1569bb5f%3a63b115ed%3a30f1f089%3a19620875%3a490a9d4e%3a7c926187%3a8674cba1%3ac08e9f8a%3aa51ee93e%3a59462f1%3a58366029%3a2bef5fcc%3ae06b58fd%3abd8f85e4:15:3557)
at Sys.WebForms.PageRequestManager._onFormSubmitCompleted (Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=RadScriptManager1_TSM&compress=1&_TSM_CombinedScripts_=%3b%3bSystem.Web.Extensions%2c+Version%3d4.0.0.0%2c+Culture%3dneutral%2c+PublicKeyToken%3d31bf3856ad364e35%3aen-US%3a14a9c2eb-bf69-4b0e-9aa0-eb85640f0e43%3aea597d4b%3ab25378d2%3bTelerik.Web.UI%2c+Version%3d2014.2.724.45%2c+Culture%3dneutral%2c+PublicKeyToken%3d121fae78165ba3d4%3aen-US%3a6915a8c2-c063-435a-ab31-d2d2285652a6%3a16e4e7cd%3af7645509%3a24ee1bba%3ae330518b%3a2003d0b8%3ac128760b%3a1e771326%3a88144a7a%3ac8618e41%3a1a73651d%3a333f8d94%3aa1a4383a%3aed16cbdc%3a6d43f6d9%3ab7778d6c%3af46195d3%3aaa288e2d%3a258f1c72%3a92fe8ea0%3afa31b949%3a874f8ea2%3adc7e0bd%3a1569bb5f%3a63b115ed%3a30f1f089%3a19620875%3a490a9d4e%3a7c926187%3a8674cba1%3ac08e9f8a%3aa51ee93e%3a59462f1%3a58366029%3a2bef5fcc%3ae06b58fd%3abd8f85e4:15:27102)
at Array.<anonymous> (Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=RadScriptManager1_TSM&compress=1&_TSM_CombinedScripts_=%3b%3bSystem.Web.Extensions%2c+Version%3d4.0.0.0%2c+Culture%3dneutral%2c+PublicKeyToken%3d31bf3856ad364e35%3aen-US%3a14a9c2eb-bf69-4b0e-9aa0-eb85640f0e43%3aea597d4b%3ab25378d2%3bTelerik.Web.UI%2c+Version%3d2014.2.724.45%2c+Culture%3dneutral%2c+PublicKeyToken%3d121fae78165ba3d4%3aen-US%3a6915a8c2-c063-435a-ab31-d2d2285652a6%3a16e4e7cd%3af7645509%3a24ee1bba%3ae330518b%3a2003d0b8%3ac128760b%3a1e771326%3a88144a7a%3ac8618e41%3a1a73651d%3a333f8d94%3aa1a4383a%3aed16cbdc%3a6d43f6d9%3ab7778d6c%3af46195d3%3aaa288e2d%3a258f1c72%3a92fe8ea0%3afa31b949%3a874f8ea2%3adc7e0bd%3a1569bb5f%3a63b115ed%3a30f1f089%3a19620875%3a490a9d4e%3a7c926187%3a8674cba1%3ac08e9f8a%3aa51ee93e%3a59462f1%3a58366029%3a2bef5fcc%3ae06b58fd%3abd8f85e4:6:307)
at Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=RadScriptManager1_TSM&compress=1&_TSM_CombinedScripts_=%3b%3bSystem.Web.Extensions%2c+Version%3d4.0.0.0%2c+Culture%3dneutral%2c+PublicKeyToken%3d31bf3856ad364e35%3aen-US%3a14a9c2eb-bf69-4b0e-9aa0-eb85640f0e43%3aea597d4b%3ab25378d2%3bTelerik.Web.UI%2c+Version%3d2014.2.724.45%2c+Culture%3dneutral%2c+PublicKeyToken%3d121fae78165ba3d4%3aen-US%3a6915a8c2-c063-435a-ab31-d2d2285652a6%3a16e4e7cd%3af7645509%3a24ee1bba%3ae330518b%3a2003d0b8%3ac128760b%3a1e771326%3a88144a7a%3ac8618e41%3a1a73651d%3a333f8d94%3aa1a4383a%3aed16cbdc%3a6d43f6d9%3ab7778d6c%3af46195d3%3aaa288e2d%3a258f1c72%3a92fe8ea0%3afa31b949%3a874f8ea2%3adc7e0bd%3a1569bb5f%3a63b115ed%3a30f1f089%3a19620875%3a490a9d4e%3a7c926187%3a8674cba1%3ac08e9f8a%3aa51ee93e%3a59462f1%3a58366029%3a2bef5fcc%3ae06b58fd%3abd8f85e4:6:51370
Any idea why and what it is?